Construction method for turnover bailey truss supporting system of ultrahigh large-span factory building

Abstract

The invention provides a construction method of a turnover bailey truss supporting system for an ultrahigh large-span factory building. An innovative solution is provided for solving the problems that a traditional construction method is low in efficiency, insufficient in safety and the like. According to the construction method, midas software is used for carrying out bailey beam stress analysis, an optimal arrangement scheme is formed, a bailey truss supporting system in modular design is adopted, through tower crane hoisting, electric hoist reshipment and precise assembly, I-shaped steel transverse distribution beams are installed on bailey truss beams, and short steel pipes are welded to prevent sideslip. In the construction process, safety is guaranteed through a digital monitoring means, and the steel bar hanging rings are embedded in the top plate structure so as to achieve follow-up segmented safe dismantling and transportation. The method has the advantages of convenient and efficient construction, repeated turnover use, reduction of redundant procedures, safe and reliable construction and the like. The method is suitable for projects such as ultrahigh large-span large-area plants in a structural form of frame columns, frame beams, secondary steel beams and steel bar truss floor support plates.

Description

Technical Field

[0001] The present invention relates to the technical field of building engineering construction, in particular to a construction method of a turnover Bailey truss support system for the construction of ultra-high and large-span factory buildings. Background Art

[0002] With the rapid development of domestic warehousing and logistics industries, large-scale factories and warehouses with increasingly demanding interior space requirements are constantly emerging. Many industrial buildings tend to adopt a "frame column + frame beam + steel secondary beam + steel truss floor deck" structure. However, this structural form poses new construction challenges. Traditional methods such as high-altitude cantilevered corbel cantilever beams and ultra-high frame support erection present numerous problems. For example, the erection of ground-based full-floor scaffolding requires high standards for pipe materials and scaffolding workers, and the erection and dismantling cycle is long. Therefore, a support system construction method with high construction efficiency, construction safety, and minimal impact on construction quality is urgently needed. Summary of the Invention

[0003] The present invention aims to provide an efficient construction method for a revolving Bailey truss support system for ultra-high and large-span factory buildings, so as to solve the problems existing in existing construction methods and improve construction efficiency, safety and quality.

[0004] The technical solution adopted in this application is

[0005] An efficient construction method for a reusable Bailey truss support system for an ultra-high and large-span factory building includes the following steps: establishing a Bailey beam model based on MIDAS software to perform stress analysis, selecting the Bailey beam with the largest span and heaviest load for calculation, and forming an optimal layout plan;

[0006] Use a tower crane to hoist the Bailey plate to the floor, and use an electric hoist to transport it to the right position. Assemble the Bailey frame truss system, install I-beams as transverse distribution beams on the Bailey truss beams, place the I-beams at one-quarter of the Bailey frame, and weld short steel pipes at the vertical steel pipe positions on the I-beams.

[0007] During the construction process, safety monitoring is carried out through digital monitoring means. When constructing the middle slab structure, pre-embedded steel bar lifting rings are used. After the top slab construction is completed, the pre-embedded lifting rings are used in combination with electric hoists and pulleys to complete the safe dismantling and transportation of sections.

[0008] Preferably, when making the column casing before construction, two sets of eight inner diameter sleeves are embedded before the formwork of a single concrete column. Steel casing and embedded casing are positioned by mold to ensure that they are consistent with the steel plate holes on the steel corbel. After the position elevation is determined, 8 steel casings are welded and connected on both sides of the casing with steel bars of 14-16mm diameter, and welded with additional steel bars tied to the main bars and stirrups to fix them without displacement; the steel plate of the steel corbel is 480X250X20 (Q345), and holes are mechanically opened on the steel plate in advance. The steel corbel is welded to the steel plate with H250X200X10X10 (Q345), and the weld thickness shall not be less than 10mm.

[0009] Preferably, when assembling and erecting the Bailey frame steel platform, 321 type Bailey frame is used as the main beam of the steel platform, and a channel steel diagonal brace support system is set at a Bailey frame spacing of 1.5m. A diagonal rod is set for stability at a Bailey plate spacing of 1.5m. The Bailey frame is connected to the Bailey frame in the vertical direction with double-piece No. 8 channel steel by bolts, and protective nets are designed on the bottom and sides, and the height of the side protective nets is not less than 1.5 meters.

[0010] Preferably, when the steel platform is hoisted and installed as a whole, the concrete strength of the frame column is not less than 100% of the design strength. The installation of the steel corbel and shoulder beam adopts two lifting vehicles and four workers to climb up. Each steel corbel has 8 high-strength through-screws with a diameter of 30 connected to the column. The steel corbel and shoulder beam are connected with M20 high-strength bolts. The Bailey frame is placed on the corbel and shoulder beam and connected with bolts. The car crane is 25 tons. The Bailey frame platform weighs about 3.5T as a whole. The steel beams at the four corners of the support frame are tied at 4 points and the guy ropes are pulled at the same time. After the crane is tried to lift smoothly, it is slowly lifted to the position above the concrete column top supporting corbel. A lifting vehicle is set on each side. The workers lift to the top of the column and connect the platform to the installed shoulder beam. After adjusting the center line to align with the axis, the hook is dropped and the hook is released after the connection is firm.

[0011] Preferably, when the Bailey frame platform is dismantled and transported, the Bailey frame support platform of the concrete secondary beam is dismantled first, and then the Bailey frame support platform of the concrete main beam is dismantled.

[0012] The efficient construction method of the revolving Bailey truss support system for ultra-high and large-span factory buildings according to claim 1 is characterized in that, during the ground load test of the steel platform, two adjacent columns are selected, sleeves are pre-buried at an elevation of two meters, corbel beams are installed, and a loading test is carried out after the Bailey frame is installed. The test loading weight is selected as a coefficient of 1.5 times the weight of the heaviest single beam in this project.

[0013] Compared with the prior art, the beneficial effects are:

[0014] Convenient and Efficient Construction: The Bailey support system utilizes a modular design, enabling efficient assembly and disassembly, significantly improving turnover. For a 1,000-square-meter area, the average daily workload per person is significantly increased compared to traditional support systems, significantly reducing labor hours and increasing construction efficiency by 75%.

[0015] Repeated Use: The spans of the plant buildings are essentially consistent, allowing for multiple Bailey frame rotations. By scientifically establishing a construction model and formulating a rotation plan, multiple projects and sections can be recycled, effectively reducing rental costs and single-use amortization expenses.

[0016] Reduce redundant processes: Compared with the traditional support system, it reduces the three processes of on-site foundation treatment, scaffolding erection, and support frame dismantling, effectively shortening the construction period and significantly promoting project progress control.

[0017] Safe and reliable construction: Advanced safety monitoring methods are used during the construction process to ensure construction safety and reduce the incidence of construction accidents. It is safer and more reliable than traditional tall support systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The construction flow chart of the construction method provided for this application;

[0019] Figure 2 A schematic diagram of a Bailey frame provided by the present invention;

[0020] Figure 3 A partial plan view of the Bailey frame provided by the present invention;

[0021] Figure 4 A diagram of the Bailey beam support provided by the present invention;

[0022] Figure 5 The elevation view of PT2 provided by the present invention;

[0023] Figure 6 The plan layout diagram of the lower chord of PT2 provided by the present invention;

[0024] Figure 7 The embedded direction of the steel casing provided by the present invention is the same as the dimension drawing of the steel secondary frame beam;

[0025] Figure 8 The concrete frame main beam steel structure platform provided by the present invention Figure 1 ;

[0026] Figure 9 The concrete frame main beam steel structure platform provided by the present invention Figure 2 ;

[0027] Figure 10 This is a schematic diagram of the overall hoisting installation of the steel platform provided by the present invention;

[0028] Figure 11 A diagram showing the locations of deformation (deflection) monitoring points of the formwork system provided by the present invention;

[0029] Figure 12The actual loading diagram in the steel platform ground load test provided by the present invention;

[0030] Figure 13 The concrete column construction scene diagram provided for this application;

[0031] Figure 14 Bailey frame ground assembly scene diagram provided for this application;

[0032] Figure 15 Bailey frame hoisting provided for this application Figure 1 ;

[0033] Figure 16 Bailey frame hoisting provided for this application Figure 2 ;

[0034] Figure 17 The concrete main beam reinforcement binding diagram provided for this application;

[0035] Figure 18 Bailey rack dismantling scene diagram provided for this application;

[0036] Figure 19 The concrete main beam reinforcement binding scene diagram provided for this application;

[0037] Figure 20 Bailey rack removal diagram provided for this application;

[0038] Figure 21 Bailey rack turnover installation scenario diagram provided for this application;

[0039] Figure 22 The concrete main beam reinforcement binding scene diagram provided for this application. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0041] 1.1 Key technologies and construction process characteristics

[0042] Considering the large area of ​​the factory building and the difficulty in setting up operating frames over a large area, Bailey frames are used for frame beam construction and are used for turnover.

[0043] 1.2 Benefit characteristics

[0044] 1.2.1 Convenient and efficient construction

[0045] The Bailey support system utilizes a modular design, offering efficient assembly and disassembly, significantly improving turnover. Standardized connecting components and mechanized operations enable rapid installation and disassembly. Conventional support systems require a full height-to-width ratio of no more than 3, so a span of 12 meters is essentially fully populated. For a 1,000-square-meter area, the Bailey support system achieves 1.4 spans per person per day, compared to 0.35 spans per person per day with conventional support systems. This significantly reduces labor hours and significantly improves construction efficiency by 75%.

[0046] 1.2.2 Repeated use

[0047] The span dimensions of factory buildings are essentially the same, allowing for multiple Bailey truss rotations. By scientifically establishing a construction model interlaced with "frame columns + frame beams + steel secondary beams + steel truss floor decks" and formulating a rotation plan, we can achieve cyclical rotation across multiple projects and bid sections. Depending on the construction schedule, Bailey trusses are generally deployed to cover one-third of the building area, allowing for two rotations. Compared to traditional supports, these structures require fewer erection, dismantling, and stacking steps, resulting in faster rotation. Leveraging the advantages of Bailey trusses significantly increases their rotational utilization rate, effectively reducing rental costs and single-time amortization expenses.

[0048] 1.2.3 Reduce redundant processes

[0049] The Bailey frame support system was used for the construction of the frame beams in this project. Compared with traditional support systems, this system eliminated three on-site processes: foundation preparation, scaffolding erection, and scaffolding removal. For a 1,000-square-meter area, foundation preparation and maintenance required five days, while scaffolding erection was reduced from four days to one, effectively shortening the construction period by eight days and significantly improving project progress control.

[0050] 1.2.4 Safe and reliable construction

[0051] This method utilizes advanced safety monitoring during construction, ensuring safe construction and reducing the incidence of construction accidents. It is safer and more reliable than traditional high-rise support systems. Furthermore, with the support of machinery with sufficient lifting capacity, it can be quickly assembled and disassembled. This method addresses the safety challenges of support systems in ultra-high and long-span formwork projects. It is simple to construct and fully meets the load-bearing requirements.

[0052] 2. Scope of application

[0053] This application is applicable to ultra-high, large-span, and large-area factories with a "frame column + frame beam + reinforced truss floor deck" structure. It can also be used in high-rise residential corridors, large complexes, and other projects.

[0054] 3. Process principle

[0055] 3.1 Sources of Key Technologies

[0056] Before construction, we used MIDAS software to build a Bailey beam model for force analysis and select the Bailey beam with the largest span and the heaviest load for calculation. Through in-depth design, we formed the optimal layout plan and implemented the measurement and placement of installation positioning points through precise control technology.

[0057] The Bailey plates were first hoisted to the floor using a tower crane, then lowered into place using an electric hoist. The Bailey frame truss system was then assembled. Once the truss support system was installed, an I-beam was installed on the Bailey truss beam as a transverse distribution beam. The I-beam was placed at one-quarter of the Bailey frame, and short steel pipes were welded to the vertical steel pipes on the I-beam to prevent the steel pipe support frame from sliding sideways. Safety monitoring was performed during operation using a digital monitoring system. During the construction of the mid-section slab structure, pre-embedded steel rings were used to prepare for later dismantling. After the top slab work was completed, the pre-embedded rings were used in conjunction with an electric hoist and pulleys to safely dismantle and transport the sections.

[0058] The construction process is as follows:

[0059] 4.2 Operation points

[0060] 4.2.1 Preparation of column casing before construction

[0061] The embedded direction of steel casing is the same as that of steel secondary frame beam. Two sets of 8 inner diameter steel casings are embedded before the formwork of a single concrete column. Steel casing (the embedded casing is positioned by the mold to ensure that it matches the steel plate hole on the steel corbel. After the position elevation is determined, the 8 steel casings are welded on both sides of the casing with steel bars of 14-16mm diameter, and finally the outer mold of the stirrups is removed), and welded with the additional steel bars tied to the main bars and stirrups to fix them without displacement. The corbel steel plate 480X250X20 (Q345) is mechanically opened on the steel plate in advance, and the steel corbel is welded to the steel plate using H250X200X10X10 (Q345). The weld thickness must not be less than 10mm. The steel corbel and shoulder beam are processed and formed in the steel structure factory. The production dimensions are as follows Figure 7 shown.

[0062] Bailey steel platform assembly and erection

[0063] like Figure 2-6 As shown,

[0064] (1) Assembly and erection of Bailey frame platform for primary and secondary beams of concrete frame:

[0065] The concrete frame main beam steel structure platform (Bailey frame system) uses 321-type Bailey frames as the main beams of the steel platform on both sides. The Bailey frames are spaced 1.5m apart to set up channel steel diagonal bracing support system. The Bailey pieces are spaced 1.5m apart to set up diagonal bars for stability. The Bailey frames are connected to the Bailey frames in the vertical direction with double-pieced No. 8 channel steel by bolts (spacing 1.5m). Protective nets are designed on the bottom and sides, and the height of the side protective nets is not less than 1.5 meters. After the concrete frame main beam steel structure platform is completed, the beam formwork can be set up and the beam reinforcement binding work can be carried out. Figure 7-8 shown.

[0066] 4.2.3 Overall hoisting and installation of steel platform

[0067] (1) When the Bailey frame platform is hoisted and installed, the concrete strength of the frame column shall not be less than 100% of the design strength. The concrete strength shall be measured using test blocks under the same conditions or concrete rebound tester. The order of hoisting the frame column concrete is to install the frame column bracket first. The steel bracket and the shoulder beam are installed by two lifting vehicles and four workers climbing up to install the steel bracket and the shoulder beam. Each steel bracket has 8 high-strength through-screws with a diameter of 30 connected to the column. The number of through-screws for each bracket connection is not less than 6. The steel bracket and the shoulder beam are connected with M20 high-strength bolts, and the number of connections is not less than 2. The Bailey frame is placed on the bracket and the shoulder beam. After placement, it must be connected with bolts. Each end of the Bailey frame is connected with M20 high-strength bolts, and the number of connections is not less than 1 at each end to prevent side sliding or tilting. When the Bailey frame is placed on the bracket and the shoulder beam, the bolts do not participate in the load and are only used for fixing. (2) The truck crane is 25 tons, and the Bailey frame platform weighs about 3.5 tons. Guy ropes are simultaneously pulled on the steel beams at the four corners of the four-point lashing support frame. After the crane is tested and lifted smoothly, it is slowly lifted to the position above the supporting bracket at the top of the concrete column.

[0068] (3) A lifting vehicle is set up on each side. Workers lift the column to the top position and connect the platform to the installed shoulder beam. After adjusting the center line to align with the axis, the hook is lowered. After the connection is firm, the hook is released. The main beam is hung with 8 M20 high-strength bolts at each end and tightened. The secondary beam is placed on the top of the shoulder beam. Each end must be connected with at least one high-strength bolt and placed sideways. Similarly, the three-span concrete frame secondary beam supporting the steel platform is hoisted.

[0069] 4.2.4 Dismantling and transport of Bailey platform

[0070] The Bailey support frame was dismantled, taking into account its recycling and secondary use. This project adopted the method of dismantling the Bailey support platform as a whole. The Bailey support platform for the secondary concrete beam was dismantled first, followed by the Bailey support platform for the main concrete beam.

[0071] 4.2.5 Steel platform ground load test, monitoring and supervision requirements

[0072] 1. Formwork system deformation (deflection) monitoring points: such as Figure 7 shown.

[0073] These are primarily installed on the primary and secondary ribs, ribs, or steel sections beneath the frame beams. When observing formwork deflection, use the beam ends as reference points and set a unified line to continuously monitor the deformation of horizontal load-bearing members at various points along the middle during construction. Based on these observations, the overall deformation safety of the frame is analyzed. The deflection of each horizontal member must be less than L / 150 and must not exceed 10mm. If the limit is reached, immediately notify the project department and all construction teams to halt construction.

[0074] 2. Monitoring measures

[0075] During the cargo loading process, the monitor is responsible for monitoring the bending deflection monitoring points of the above-mentioned tall formwork; the person in charge of the formwork erection team and the safety officer shall check the brackets and supports. If any looseness, deformation and horizontal displacement are found, the construction personnel shall be evacuated in time.

[0076] 3. Monitoring instrument and equipment configuration

[0077] Serial number Testing equipment name Specifications quantity 1 theodolite electronic 2 units 2 Level electronic 2 units 3 torque wrench -- 6 4 Steel tape measure 50m, 5m 1, 5

[0078] 4. Steel platform ground load test

[0079] For the ground load test, first select two adjacent columns, embed casing at a height of two meters, install the corbel beam and Bailey frame in the same way as the upper construction requirements, and then conduct a heap load test after installation. The test heap load weight is 1.5 times the weight of the heaviest single beam in this project. The heaviest single beam in this project weighs 24 tons, and the heap load test requires a heap load of 36 tons. Depending on the project situation, steel bars can be used as linear uniform loads and as heap load weight blocks. The actual heap load is as follows: Figure 8 shown.

[0080] 4.3 Workforce Organization

[0081] Labor Organization Situation Table

[0082] Serial number Operators Number of people 1 Truck crane driver and commander 6 2 electrician 1 3 forklift driver 2 4 welder 2 5 Bailey frame installer 16 6 Handyman 4

[0083] List of workers and quantity division of labor

[0084] Serial number Type of work Number of people Remark 1 Carpentry 80 Formwork installation 2 Rebar Worker 70 Rebar tying 3 concrete worker 20 Concrete pouring 4 Handyman 30 Cooperate with scaffold workers to set up other sporadic

[0085] 5 Materials and Equipment

[0086] 5.1 Materials and Equipment

[0087] Table 5.1.1 Construction Materials

[0088]

[0089] 5.2 Mechanical equipment

[0090] Table 5.1.2 Machinery and Equipment Status

[0091] Serial number Device Name model Rated power quantity 1 Electric wrench SZ-50A 10 10 2 welding machine AX5-500 22 3 3 lift truck CN-50A 0.55 4 4 Truck crane XCT25L5 25 4

[0092] 6. Quality Control

[0093] 6.1 Specifications and standards followed by this method

[0094] (1) "Uniform Standard for Acceptance of Construction Quality of Building Projects" (GB50300-2013);

[0095] (2) "Code for Acceptance of Construction Quality of Concrete Structure Engineering" (GB50204-2015)

[0096] (3) Code for Construction of Concrete Structures (GB50666-2011);

[0097] (4) Technical Specifications for Safety of Construction Formwork (JGJ162-2008);

[0098] (5) Construction Safety Inspection Standard (JGJ59-2011);

[0099] (6) Code for Loads on Building Structures (GB50009-2012);

[0100] (7) Standard for Design of Steel Structures (GB 50017-2017);

[0101] (8) Code for Welding of Steel Structures (GB 50661-2011);

[0102] (9) Low Alloy High Strength Structural Steel (GB / T 1591-2018);

[0103] (10) Carbon Structural Steel (GB / T 700-2006);

[0104] (11) High-quality carbon structural steel (GB / T 699-2015);

[0105] (12) Steel Plates for Building Structures (GB / T 19879-2005);

[0106] (13) “Torsion-shear high-strength bolt connections for steel structures” (GB / T 3632-2008);

[0107] (14) Surface Rust Grade and Rust Removal Grade of Steel Materials Before Painting (GB 8923-2011);

[0108] (15) Code for Acceptance of Construction Quality of Steel Structure Engineering (GB 50205-2020);

[0109] 6.2 Quality acceptance standards

[0110] 6.2.1 Steel platform acceptance requirements

[0111] Before the installation and production of the steel platform, the weld size and bolt connection should be inspected and accepted, and the acceptance must meet the requirements of the "Code for Construction Quality Acceptance of Steel Structure Engineering" GB50205-2020.

[0112] The first steel beam platform should be subjected to a loading test after it is manufactured and installed, and construction can only be carried out after the platform is reliable.

[0113] 6.2.2 Formwork acceptance requirements

[0114] The erection of formwork should meet the acceptance requirements of "Safety Technical Specifications for Coupler-Type Steel Pipe Scaffolding in Construction" JGJ130-2011.

[0115] 6.2.3 Concrete strength acceptance requirements

[0116] There are two key control points for concrete strength grade in the construction of this scheme:

[0117] 1. When the steel platform is hoisted onto the steel bracket, the strength grade of the concrete column shall not be less than 75% of the design

[0118] 2. Before removing the bottom formwork support of the frame beam, the beam strength must reach 100% of the design strength

[0119] The time nodes of the above strength requirements should meet the "Concrete Structure Engineering Construction Quality Acceptance Code" GB50204-2015, and for winter construction, it must also meet the requirements of the "Winter Construction Code for Construction Projects" JGJ104-2011.

[0120] Table 6.3.1 Deviation table for installation of cast-in-place structure formwork

[0121]

[0122] 7. Safety measures

[0123] 7.1 Safety regulations to be complied with by this method

[0124] 1. Construction Safety Inspection Standard JGJ59-2011;

[0125] 2. Technical Specifications for Temporary Electricity Safety at Construction Sites JGJ46-2005;

[0126] 3. "Safety Technical Regulations for the Use of Construction Machinery" JGJ33-2012;

[0127] 4. Technical Specifications for Safety of Height Operations in Construction JGJ80-2016.

[0128] 7.2 Security measures

[0129] 1. When using oxygen, acetylene cutting, electric welding, etc., attention should be paid to safety and fire prevention.

[0130] 2. It is prohibited to stack flammable and explosive items and garbage on the template; the equipment must be kept clean and tidy.

[0131] 3. Steel structure installation, disassembly and construction work should prevent objects falling from heights from injuring people.

[0132] 4. When the formwork is being lifted, there should be a dedicated person to direct the operation.

[0133] 5. Concrete pouring must be carried out evenly and symmetrically. The maximum height difference of concrete on both sides shall not exceed 0.3m to prevent the formwork from being biased.

[0134] 6. The pouring speed of concrete should be strictly controlled to prevent it from floating up or damaging the formwork due to excessive pressure.

[0135] 7. The personnel who inspect the formwork should seriously check the safety of concrete pouring. If any dangerous situation is found, they should give a signal to stop concrete pouring in time to prevent construction accidents such as formwork running and slurry leakage.

[0136] 8. Environmental protection measures

[0137] Throughout the construction process, we implement comprehensive pollution prevention and control measures based on objective environmental factors such as dust, sewage, noise, and solid waste to minimize and prevent adverse environmental impacts. We classify and dispose of solid waste generated during construction, ensure noise control meets the requirements of GB12523-2011, and achieve 100% compliance with wastewater discharge concentration standards.

[0138] 8.1 Preventing air pollution

[0139] 1. Assign a special person to sprinkle water on site every day to prevent dust and clean the combined steel formwork construction area in time.

[0140] 2. Frequently sprinkle water on construction sites prone to dust generation to reduce dust.

[0141] 3. It is strictly prohibited to burn toxic and harmful substances generated by construction.

[0142] 8.2 Preventing water pollution

[0143] 1. The wastewater generated by cleaning the composite steel mold must be treated and the water quality must meet the standards.

[0144] 2. Measures must be taken when storing and using various machine oils and release agents to prevent environmental pollution.

[0145] 8.3 Preventing noise pollution

[0146] 1. All transport vehicles are prohibited from honking their horns on site to reduce noise.

[0147] 2. Reduce formwork processing and other formwork operations at night, reduce steel bar cutting, and prevent noise pollution.

[0148] 8.4 Prevent pollution of the construction site

[0149] 1) The construction site is closed and fenced off, and construction waste is cleaned up in a timely manner;

[0150] 2) All construction workers should maintain site hygiene, and production and domestic waste should be bagged and put into vehicles for take away, and should not be thrown anywhere.

[0151] 3) At night, construction lights are concentrated on the site to prevent them from disturbing others.

[0152] 4) Ensure site cleanup after work is completed. The entire template storage area and construction site should be orderly, clean and pollution-free, with low noise, low dust and low energy consumption.

[0153] 9. Benefit Analysis

[0154] 9.1 Social benefits: The use of Bailey frames not only simplifies the construction process and saves construction time, but also ensures the stability of the formwork support system, thereby ensuring the construction quality of the joint structure: it successfully solves the problem of not being able to use steel pipe scaffolding to complete the erection of the formwork support system: because Bailey frames can be used repeatedly, resources are saved.

[0155] 9.2 Economic Benefits: The ground-type scaffolding is used, which requires approximately 260 tons of steel pipes and 41,600 fasteners, and the construction period is 6 months.

[0156] 10. Application Examples

[0157] This method has been successfully applied in the Ruipu Lanjun Wenzhou New Energy Manufacturing Base A-05a Land Construction Project and the ** Project. The project quality meets regulatory requirements and has achieved good social and economic benefits. The application of this method is now illustrated using these two projects as examples.

[0158] 10.1 Overview of Application Projects

[0159] The A-05a plot construction project of Ruipu Lanjun Wenzhou New Energy Manufacturing Base covers an area of ​​approximately 380,000 square meters, with a total construction area of ​​approximately 680,000 square meters, including a basement area of ​​approximately 8,100m 2, a total of 14 buildings. Among them, 1#2# buildings are comprehensive office buildings, 3#~8# and 14#, 15# are workshops, 9#~12# are auxiliary buildings, and the rest are energy storage power stations, distillation towers and other ancillary facilities. Construction will start in April 2023. Figure 13-18 shown.

[0160] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An efficient construction method for a revolving Bailey truss support system for an ultra-high and large-span factory building, characterized by: The following steps are involved: A Bailey beam model was established based on MIDAS software for stress analysis. The Bailey beam with the largest span and the heaviest load was selected for calculation to form the optimal layout plan. Use a tower crane to hoist the Bailey plate to the floor, and use an electric hoist to transport it to the right position. Assemble the Bailey frame truss system, install I-beams as transverse distribution beams on the Bailey truss beams, place the I-beams at one-quarter of the Bailey frame, and weld short steel pipes at the vertical steel pipe positions on the I-beams. During the construction process, safety monitoring is carried out through digital monitoring means. When constructing the middle slab structure, pre-embedded steel bar lifting rings are used. After the top slab construction is completed, the pre-embedded lifting rings are used in combination with electric hoists and pulleys to complete the safe dismantling and transportation of sections.

2. The efficient construction method of the revolving Bailey truss support system for ultra-high and large-span factory buildings according to claim 1 is characterized in that: When making the column casing before construction, 2 sets of 8 inner diameter pipes are embedded in front of the formwork of a single concrete column. The steel casing and the embedded casing are positioned by the mold to ensure that they are consistent with the steel plate holes on the steel corbel. After the position elevation is determined, the 8 steel casings are welded and connected on both sides of the casing with steel bars of 14-16mm diameter, and welded with the additional steel bars tied to the main bars and stirrups to fix them without displacement; the steel plate of the steel corbel is 480×250×20, and holes are mechanically opened on the steel plate in advance. The steel corbel is welded to the steel plate with H250×200×10×10, and the weld thickness shall not be less than 10mm.

3. The efficient construction method of the revolving Bailey truss support system for ultra-high and large-span factory buildings according to claim 1 is characterized in that: When assembling and erecting the Bailey frame steel platform, 321 type Bailey frame is used as the main beam of the steel platform. Channel steel diagonal bracing support system is set at a distance of 1.5m between Bailey frames, and diagonal rods are set for stability at a distance of 1.5m between Bailey plates. The Bailey frame is connected to the Bailey frame in the vertical direction with double-piece No. 8 channel steel by bolts. Protective nets are designed on the bottom and sides, and the height of the side protective nets is not less than 1.5 meters.

4. The efficient construction method of the revolving Bailey truss support system for ultra-high and large-span factory buildings according to claim 1 is characterized in that: When the steel platform is hoisted and installed as a whole, the concrete strength of the frame column shall not be less than 100% of the design strength. Two lifting vehicles and four workers are used to install the steel corbels and shoulder pole beams. Each steel corbel has eight high-strength through-screws with a diameter of 30 connected to the column. The steel corbels and shoulder pole beams are connected with M20 high-strength bolts. The Bailey frame is placed on the corbels and shoulder pole beams and connected with bolts. The car crane is 25 tons. The Bailey frame platform weighs about 3.5T as a whole. The 4-point binding support frame is supported by guy ropes at the same time on the steel beams at the four corners. After the crane is tried to lift smoothly, it is slowly lifted to the position above the concrete column top supporting corbels. A lifting vehicle is set on each side. The workers lift the column to the top position and connect the platform to the installed shoulder pole beam. After adjusting the center line to align with the axis, the hook is dropped and the hook is released after the connection is secure.

5. The efficient construction method of the revolving Bailey truss support system for ultra-high and large-span factory buildings according to claim 1 is characterized in that: When the Bailey frame platform is dismantled and transported, the Bailey frame support platform of the concrete secondary beam is dismantled first, and then the Bailey frame support platform of the concrete main beam is dismantled.

6. The efficient construction method of the revolving Bailey truss support system for ultra-high and large-span factory buildings according to claim 1 is characterized in that: When conducting the ground load test on the steel platform, two adjacent columns are selected, casing is embedded at an elevation of two meters, and the corbel beam is installed. After the Bailey frame is installed, a loading test is conducted. The test loading weight is 1.5 times the weight of the heaviest single beam in this project.

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