Construction method of super-large-span dry coal shed grid structure

Abstract

The invention relates to the field of construction of a super-large-span dry coal shed grid structure, in particular to a construction method of a super-large-span dry coal shed grid structure, and provides the following scheme aiming at the defects that the existing friction resistance is very large, instability accidents are likely to happen, the construction difficulty is large, and certain quality and potential safety hazards exist. The method comprises the following steps: S1, determining an installation scheme: establishing a model working condition checking calculation and determining a reference unit; s2, construction preparation: determining a construction scheme, technical preparation and material and machine preparation; s3, measuring and paying off: measuring and recording, and leveling a site; s4, a temporary supporting device is arranged; and S5, a sliding rail is laid, and a rolling bearing is arranged on the sliding rail. By optimizing the sliding system and strengthening synchronous control and modular construction, the problem of structural deformation control of the ultra-large-span dry coal shed net rack with the span being 150 m or above can be effectively solved, the construction difficulty is lowered, and safety is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of ultra-large span dry coal shed grid structure construction, and in particular to a ultra-large span dry coal shed grid structure construction method. Background Art

[0002] Open-air storage yards requiring dust suppression, such as coal yards at large thermal power plants and ore yards at metallurgical enterprises, must be enclosed. For open-air storage yards with spans under 140 meters, the most economical and reasonable method is a grid structure. Grid structures with spans between 100 and 140 meters are referred to as "super-long-span grid structures." The construction of super-long-span grid structures still utilizes traditional techniques: grid sliding, cradle sliding, and high-altitude loose assembly.

[0003] Traditional construction technology has very large friction resistance and is prone to instability accidents. It is difficult to construct and has certain quality and safety risks. Therefore, we proposed a super-large span dry coal shed grid structure construction method to solve the above problems. Summary of the Invention

[0004] Based on the technical problems in the background technology that the friction resistance is very large and instability accidents are likely to occur, the construction is difficult, and there are certain quality and safety hazards, the present invention proposes a construction method for an ultra-large span dry coal shed grid structure.

[0005] The present invention proposes a method for constructing a super-large-span dry coal shed grid structure, comprising the following steps:

[0006] S1: Determine the installation plan: establish model working condition verification and determine the benchmark unit;

[0007] S2: Construction preparation: determine the construction plan, technical preparation, and preparation of materials and equipment;

[0008] S3: Measurement and layout: measurement and record, site leveling;

[0009] S4: Set up temporary support devices;

[0010] S5: Laying a sliding track, wherein a rolling bearing is provided on the sliding track;

[0011] S6: Assembling the basic unit grid: Assembling the small unit local structure through the basic unit;

[0012] S7: Equipped with a hydraulic crawler, it realizes multi-point and multi-level synchronous drive through a PLC control system to slide the small unit local structure to the preset position;

[0013] S8: Aerial cantilever: Use a crane to assemble the small unit partial structure into a basic span, forming the installation starting unit. Adjust its construction deviation. After meeting the design and specification requirements, use this as a benchmark to expand the grid until the overall grid installation is completed.

[0014] S9: Real-time monitoring of grid deflection;

[0015] S10: Perform weld inspection after installation is completed.

[0016] Preferably, in said S4, a temporary support device is provided: a PHC pipe pile foundation is adopted, with a pile diameter of 600 mm, a spacing of 4 m×4 m, and a single pile bearing capacity of ≥3000 kN.

[0017] Preferably, the S7 is equipped with a hydraulic crawler, which realizes multi-point and multi-stage synchronous driving through a PLC control system, and slides the local structure of the small unit to a preset position, with a speed controlled at 0.5m / min and a sliding synchronization error of ≤10mm.

[0018] Preferably, in S9, a total station + prism positioning system is used to monitor the deflection of the grid in real time.

[0019] Preferably, when the deviation exceeds 20 mm, the hydraulic jack is activated for fine adjustment.

[0020] Preferably, in S10, ultrasonic testing is used to perform weld inspection after installation is completed.

[0021] Preferably, in S5, the sliding rail is made of Q345B steel.

[0022] Preferably, in said S8, during the process of expanding the grid, stress sensors and Beidou positioning system are integrated to realize dynamic early warning of structural stress and deformation.

[0023] Preferably, in said S8, after the installation of the whole grid is completed, anti-corrosion treatment is performed.

[0024] Preferably, the anti-corrosion treatment adopts epoxy zinc-rich primer + polyurethane topcoat.

[0025] The beneficial effects of the present invention are:

[0026] By laying sliding tracks, frictional resistance can be reduced;

[0027] By setting up temporary support devices, safety can be guaranteed;

[0028] Adopting ground assembly + overall sliding mode to reduce the amount of high-altitude work and shorten the construction period;

[0029] Integrate stress sensors with the Beidou positioning system to achieve dynamic early warning of structural stress and deformation;

[0030] By optimizing the sliding system, strengthening synchronous control and modular construction, the present invention can effectively solve the problem of structural deformation control of dry coal shed grids with ultra-large spans of more than 150 meters, reduce construction difficulty and ensure safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention provides a flow chart of a method for constructing a super-large-span dry coal shed grid structure. DETAILED DESCRIPTION

[0032] The present invention will be further explained below with reference to specific embodiments.

[0033] Example 1

[0034] Reference Figure 1 The present invention proposes a method for constructing a super-large span dry coal shed grid structure, comprising the following steps:

[0035] S1: Determine the installation plan: establish model working condition verification and determine the benchmark unit;

[0036] S2: Construction preparation: determine the construction plan, technical preparation, and preparation of materials and equipment;

[0037] S3: Measurement and layout: measurement and record, site leveling;

[0038] S4: Set up temporary support device: use PHC pipe pile foundation, pile diameter 600mm, spacing 4m×4m, single pile bearing capacity ≥3000kN;

[0039] S5: Laying a sliding track, wherein a rolling bearing is provided on the sliding track;

[0040] S6: Assembling the basic unit grid: Assembling the small unit local structure through the basic unit;

[0041] S7: Equipped with a hydraulic crawler, it realizes multi-point and multi-level synchronous drive through a PLC control system to slide the small unit local structure to the preset position;

[0042] S8: Aerial cantilever: Use a crane to assemble the small unit partial structure into a basic span, forming the installation starting unit. Adjust its construction deviation. After meeting the design and specification requirements, use this as a benchmark to expand the grid until the overall grid installation is completed.

[0043] S9: Using total station + prism positioning system, real-time monitoring of grid deflection is carried out. When the deviation exceeds 20mm, hydraulic jack fine-tuning is activated.

[0044] S10: After installation is completed, ultrasonic testing is used to inspect the welds.

[0045] Example 2

[0046] Reference Figure 1 The present invention proposes a method for constructing a super-large span dry coal shed grid structure, comprising the following steps:

[0047] S1: Determine the installation plan: establish model working condition verification and determine the benchmark unit;

[0048] S2: Construction preparation: determine the construction plan, technical preparation, and preparation of materials and equipment;

[0049] S3: Measurement and layout: measurement and record, site leveling;

[0050] S4: Set up temporary support device: use PHC pipe pile foundation, pile diameter 600mm, spacing 4m×4m, single pile bearing capacity ≥3000kN;

[0051] S5: Laying a sliding track, wherein a rolling bearing is provided on the sliding track;

[0052] S6: Assembling the basic unit grid: Assembling the small unit local structure through the basic unit;

[0053] S7: Equipped with a hydraulic crawler, it realizes multi-point and multi-level synchronous drive through a PLC control system to slide the small unit local structure to the preset position;

[0054] S8: Aerial cantilever: Use a crane to assemble the small unit partial structure into a basic span, forming the installation starting unit. Adjust its construction deviation. After meeting the design and specification requirements, use this as a benchmark to expand the grid until the overall grid installation is completed.

[0055] S9: Using total station + prism positioning system, real-time monitoring of grid deflection is carried out. When the deviation exceeds 20mm, hydraulic jack fine-tuning is activated.

[0056] S10: After installation is completed, ultrasonic testing is used to inspect the welds.

[0057] The difference between this embodiment and the first embodiment is that rolling bearings are used instead of traditional sliding supports to convert surface friction into rolling friction, thereby reducing frictional resistance; the track is made of Q345B steel, and the laying accuracy requirements are that the axis deviation is ≤3mm and the elevation error is ≤2mm.

[0058] Example 3

[0059] Reference Figure 1 The present invention proposes a method for constructing a super-large span dry coal shed grid structure, comprising the following steps:

[0060] S1: Determine the installation plan: establish model working condition verification and determine the benchmark unit;

[0061] S2: Construction preparation: determine the construction plan, technical preparation, and preparation of materials and equipment;

[0062] S3: Measurement and layout: measurement and record, site leveling;

[0063] S4: Set up temporary support device: use PHC pipe pile foundation, pile diameter 600mm, spacing 4m×4m, single pile bearing capacity ≥3000kN;

[0064] S5: Laying a sliding track, wherein a rolling bearing is provided on the sliding track;

[0065] S6: Assembling the basic unit grid: Assembling the small unit local structure through the basic unit;

[0066] S7: Equipped with a hydraulic crawler, it realizes multi-point and multi-level synchronous drive through a PLC control system to slide the small unit local structure to the preset position;

[0067] S8: Aerial cantilever: Use a crane to assemble the small unit partial structure into a basic span, forming the installation starting unit. Adjust its construction deviation. After meeting the design and specification requirements, use this as a benchmark to expand the grid until the overall grid installation is completed.

[0068] S9: Using total station + prism positioning system, real-time monitoring of grid deflection is carried out. When the deviation exceeds 20mm, hydraulic jack fine-tuning is activated.

[0069] S10: After installation is completed, ultrasonic testing is used to inspect the welds.

[0070] The difference between this embodiment and the first embodiment is that the grid is divided into 25m×25m standard unit modules, which are assembled on the ground using a 500t crawler crane and then slid as a whole; adjustable positioning pins are provided at the module joints to allow ±10mm installation tolerance compensation.

[0071] Example 4

[0072] Reference Figure 1 The present invention proposes a method for constructing a super-large span dry coal shed grid structure, comprising the following steps:

[0073] S1: Determine the installation plan: establish model working condition verification and determine the benchmark unit;

[0074] S2: Construction preparation: determine the construction plan, technical preparation, and preparation of materials and equipment;

[0075] S3: Measurement and layout: measurement and record, site leveling;

[0076] S4: Set up temporary support device: use PHC pipe pile foundation, pile diameter 600mm, spacing 4m×4m, single pile bearing capacity ≥3000kN;

[0077] S5: Laying a sliding track, wherein a rolling bearing is provided on the sliding track;

[0078] S6: Assembling the basic unit grid: Assembling the small unit local structure through the basic unit;

[0079] S7: Equipped with a hydraulic crawler, it realizes multi-point and multi-level synchronous drive through a PLC control system to slide the small unit local structure to the preset position;

[0080] S8: Aerial cantilever: Use a crane to assemble the small unit partial structure into a basic span, forming the installation starting unit. Adjust its construction deviation. After meeting the design and specification requirements, use this as a benchmark to expand the grid until the overall grid installation is completed.

[0081] S9: Using total station + prism positioning system, real-time monitoring of grid deflection is carried out. When the deviation exceeds 20mm, hydraulic jack fine-tuning is activated.

[0082] S10: After installation is completed, ultrasonic testing is used to inspect the welds.

[0083] The difference between this embodiment and the first embodiment is that: a PHC pipe pile foundation is adopted, with a pile diameter of 600 mm, a spacing of 4 m×4 m, a single pile bearing capacity of ≥3000 kN, a pile position deviation of ≤50 mm, and a verticality of ≤1%.

[0084] Example 5

[0085] Reference Figure 1 The present invention proposes a method for constructing a super-large span dry coal shed grid structure, comprising the following steps:

[0086] S1: Determine the installation plan: establish model working condition verification and determine the benchmark unit;

[0087] S2: Construction preparation: determine the construction plan, technical preparation, and preparation of materials and equipment;

[0088] S3: Measurement and layout: measurement and record, site leveling;

[0089] S4: Set up temporary support device: use PHC pipe pile foundation, pile diameter 600mm, spacing 4m×4m, single pile bearing capacity ≥3000kN;

[0090] S5: Laying a sliding track, wherein a rolling bearing is provided on the sliding track;

[0091] S6: Assembling the basic unit grid: Assembling the small unit local structure through the basic unit;

[0092] S7: Equipped with a hydraulic crawler, it realizes multi-point and multi-level synchronous drive through a PLC control system to slide the small unit local structure to the preset position;

[0093] S8: Aerial cantilever: Use a crane to assemble the small unit partial structure into a basic span, forming the installation starting unit. Adjust its construction deviation. After meeting the design and specification requirements, use this as a benchmark to expand the grid until the overall grid installation is completed.

[0094] S9: Using total station + prism positioning system, real-time monitoring of grid deflection is carried out. When the deviation exceeds 20mm, hydraulic jack fine-tuning is activated.

[0095] S10: After installation is completed, ultrasonic testing is used to inspect the welds.

[0096] The difference between this embodiment and the first embodiment is that: a high-altitude bulk method is combined with ground pre-assembly, E5015 welding rods are used for welding ball nodes, and the preheating temperature is ≥120°C; the rod length error is ≤1‰, and the ball node eccentricity is ≤2mm.

[0097] 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. A method for constructing a super-large span dry coal shed grid structure, characterized in that: The following steps are involved: S1: Determine the installation plan: establish model working condition verification and determine the benchmark unit; S2: Construction preparation: determine the construction plan, technical preparation, and preparation of materials and equipment; S3: Measurement and layout: measurement and record, site leveling; S4: Set up temporary support devices; S5: Laying a sliding track, wherein a rolling bearing is provided on the sliding track; S6: Assembling the basic unit grid: Assembling the small unit local structure through the basic unit; S7: Equipped with a hydraulic crawler, it realizes multi-point and multi-level synchronous drive through a PLC control system to slide the small unit local structure to the preset position; S8: Aerial cantilever: Use a crane to assemble the small unit partial structure into a basic span, forming the installation starting unit. Adjust its construction deviation. After meeting the design and specification requirements, use this as a benchmark to expand the grid until the overall grid installation is completed. S9: Real-time monitoring of grid deflection; S10: Perform weld inspection after installation is completed.

2. The method for constructing a super-large span dry coal shed grid structure according to claim 1, characterized in that: In the above S4, a temporary support device is provided: a PHC pipe pile foundation is adopted, with a pile diameter of 600 mm, a spacing of 4 m×4 m, and a single pile bearing capacity of ≥3000 kN.

3. The method for constructing a super-large span dry coal shed grid structure according to claim 1, characterized in that: The S7 is equipped with a hydraulic crawler, which realizes multi-point and multi-level synchronous driving through a PLC control system, and slides the local structure of the small unit to a preset position. The speed is controlled at 0.5m / min, and the sliding synchronization error is ≤10mm.

4. The method for constructing a super-large-span dry coal shed grid structure according to claim 1, characterized in that: In the S9, a total station + prism positioning system is used to monitor the deflection of the grid in real time.

5. The method for constructing a super-large-span dry coal shed grid structure according to claim 4, characterized in that: When the deviation exceeds 20mm, start the hydraulic jack for fine adjustment.

6. The method for constructing a super-large-span dry coal shed grid structure according to claim 1, characterized in that: In S10, after the installation is completed, ultrasonic testing is used to perform weld inspection.

7. The method for constructing a super-large span dry coal shed grid structure according to claim 1, characterized in that: In the S5, the sliding track is made of Q345B steel.

8. The method for constructing a super-large-span dry coal shed grid structure according to claim 1, characterized in that: In the S8, during the grid expansion process, stress sensors and the Beidou positioning system are integrated to achieve dynamic early warning of structural stress and deformation.

9. The method for constructing a super-large-span dry coal shed grid structure according to claim 1, characterized in that: In S8, after the overall grid is installed, anti-corrosion treatment is performed.

10. The method for constructing a super-large span dry coal shed grid structure according to claim 9, characterized in that: Anti-corrosion treatment uses epoxy zinc-rich primer + polyurethane topcoat.

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