Construction method of split type circulating water cooling tower group

Abstract

The invention discloses a construction method of a split type circulating water cooling tower group, which comprises the following steps of: manufacturing a foundation bolt fixing clamp, positioning and fixing a foundation bolt by using the foundation bolt fixing clamp, and carrying out precision calibration by using measuring equipment and a positioning algorithm; the water cooling tower steel structure is divided into a plurality of modules, and splicing, rust removal and preservative treatment of the modules are completed on the ground; hoisting the steel structure modules assembled on the ground to a preset position and mounting the steel structure modules by adopting a layered and segmented hoisting process; a circulating water main pipe, a top deck, a guardrail, a filler layer, a water distribution system, a motor, a fan system support and an air duct are sequentially installed on the installed steel structure. According to the construction method of the large split type circulating water cooling tower group, the adjustable foundation bolt fixing clamp is adopted, and high-precision positioning of the foundation bolts is achieved. Layered and segmented modular construction is adopted, the construction period is shortened, and the construction efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of circulating water system construction, specifically a construction method for a large-scale split-type circulating water cooling tower group. Background Technology

[0002] As one of the core facilities in the circulating water area, the split-type cooling tower is characterized by its small weight, large number of parts, and large size. Its construction process involves multiple professional fields such as anchor bolts, steel structures, process pipelines, and equipment, and has extremely high requirements for construction precision and procedures.

[0003] The installation of the main body of the cooling tower is not only a large-scale undertaking requiring the coordinated efforts of numerous workers, but also presents significant operational risks. Traditional construction methods often suffer from slow installation progress, low efficiency, large cumulative errors, and high costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a construction method for a split-type circulating water cooling tower group, so as to at least improve the construction efficiency.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A construction method for a split-type circulating water cooling tower group includes: Step 1: Fabricate anchor bolt fixing clamps, use the anchor bolt fixing clamps to position and fix the anchor bolts, and use measuring equipment and positioning algorithms to perform accuracy calibration; Step two: Divide the steel structure of the cooling tower into multiple modules, and complete the assembly, rust removal and anti-corrosion treatment of the modules on the ground; Step 3: Using a layered and segmented hoisting process, the steel structure modules assembled on the ground are hoisted to the predetermined positions and installed. Step four: On the completed steel structure, install the main circulating water pipe, the top deck and guardrail, the filler layer, the water distribution system, the motor and fan system support, and the ventilation duct in sequence.

[0006] In a preferred embodiment, in step one, the anchor bolt fixing clamp includes a channel steel frame and adjusting bolts. The channel steel frame includes crossbeams, longitudinal beams, and side plates. At least two crossbeams and at least two longitudinal beams are perpendicularly connected to each other. The ends of the crossbeams and longitudinal beams are perpendicularly connected to the side plates. The upper and lower flanges of the crossbeams and longitudinal beams are provided with fixing holes for inserting anchor bolts. Adjustable connectors are provided on the side plates for fixing the anchor bolt fixing clamp to the concrete foundation column and finely adjusting its position.

[0007] In a preferred embodiment, the diameter of the fixing hole is φ26mm, and the connector is an M20×150mm adjusting bolt.

[0008] In a preferred embodiment, in step two, the main steel structure of the cooling tower is divided into an upper module and a lower module along the height direction; wherein, the lower module adopts a portal-type module, and the upper module adopts a beam-type module.

[0009] In a preferred embodiment, in step three, the lower-level portal frame module is first hoisted, aligned and fixed, and then the upper-level beam module is hoisted.

[0010] In a preferred embodiment, step four, the step of installing the filler layer, includes transporting the filler blocks to the installation layer, laying load-bearing wooden boards on top of the filler, and having construction workers stand on the wooden boards to carry out the installation, ensuring that the gap between the filler blocks is ≤5mm.

[0011] As a preferred embodiment, in step four, the water distribution system is installed by fixing the water distribution branch pipe to the steel structure with a U-shaped clamp, and installing water distribution pipes and nozzles on the water distribution branch pipe to ensure that water can be sprayed evenly on the filler layer.

[0012] As a preferred embodiment, in step four, when installing the air duct, a cross-shaped suspension bracket is fabricated on-site to install the air duct, and a crane is used to lift the air duct to the top installation position.

[0013] The construction method for a large-scale split-type circulating water cooling tower group provided by this invention uses adjustable anchor bolt fixing clamps to achieve high-precision positioning of the anchor bolts. The layered, segmented, and modular construction method shortens the construction cycle, improves construction efficiency, solves the problem of large scaffolding requirements during structural installation, reduces high-altitude work, and improves construction safety. Attached Figure Description

[0014] The accompanying drawings, which are provided to further illustrate the invention and form part of this application, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention.

[0015] Figure 1 This is a reference diagram showing the usage state of the anchor bolt fixing clamp provided by the present invention.

[0016] In the diagram, 1-crossbeam, 2-longitudinal beam, 3-side plate, 4-anchor bolt, 5-connector, 6-concrete foundation column. Detailed Implementation

[0017] The present invention provides a typical embodiment of a construction method for a split-type circulating water cooling tower group, including construction preparation, fabrication and welding of anchor bolt fixing clamps, anchor bolt fixing and grouting, installation of steel structure, installation of main water pipe, installation of top deck and guardrail, installation of filler, installation of water distribution system, installation of brackets for motor and fan system, and installation of ventilation duct.

[0018] Construction preparation Temporary facilities were erected, and the construction team inspected the site, enclosed warehouses, and storage areas. Generators and power lines were installed to ensure power supply during construction. Temporary roads, 6 meters wide, were laid on both sides of the cooling tower and at crane locations.

[0019] On the basis of site leveling, the temporary road structure layer consists of 200mm thick coarse sand, geogrid, 200mm thick crushed stone, compacted by a vibratory roller, and then cement slabs are laid to ensure the passage of heavy vehicles and aerial work platforms.

[0020] Fabrication of welding anchor bolt fixing fixtures The civil engineering steel structure foundation was reviewed and inspected to ensure that the foundation dimensions, elevation, strength, etc., met the design requirements. The foundation was then cleaned to ensure that there was no debris or standing water.

[0021] An anchor bolt fixing clamp is fabricated, comprising a channel steel frame and adjusting bolts. The channel steel frame includes a crossbeam 1, a longitudinal beam 2, and a side plate 3. Two crossbeams 1 and two longitudinal beams 2 are perpendicularly connected, and the ends of the crossbeams 1 and longitudinal beams 2 are perpendicularly connected to the side plate 3. The upper and lower flanges of the crossbeams 1 and longitudinal beams 2 are provided with fixing holes for inserting anchor bolts 4. The side plate 3 is provided with an adjustable connector 5 for fixing the anchor bolt fixing clamp to the concrete foundation column 6 and finely adjusting its position.

[0022] The aforementioned channel steel support utilizes double-layer welding of [10 channel steel. φ26 holes are drilled on both the upper and lower flanges of the channel steel as fixing holes for installing anchor bolts 4. After installing the anchor bolts 4, nuts are used to adjust the elevation. The four side plates 3 are connected to the concrete foundation column 6 using M20*150 bolts as connectors 5, facilitating the fixing and adjustment of the anchor bolt center position.

[0023] After the anchor bolts are installed, measuring equipment and positioning algorithms are used to achieve high-precision positioning of the anchor bolts, ensuring the accuracy and reliability of the installation position.

[0024] Anchor bolt fixing and grouting After the anchor bolt fixing clamps are installed, measured and adjusted, grouting of the anchor bolt reserved holes can be carried out. The reserved holes for grouting should be cleaned, and non-shrink grout should be used. During grouting, vibration should be used to compact the grout. The anchor bolts should not be tilted during grouting.

[0025] Install steel structure The steel structure of the cooling tower is characterized by numerous components and bolted joints. Considering the costs of scaffolding erection and construction machinery, and the significant risks associated with working at heights, a layered and segmented hoisting construction process was adopted during installation. All procedures, including rust removal and corrosion prevention at joints, were completed on the ground.

[0026] After the pre-embedded anchor bolts reach their strength, the steel structure to be installed is divided into layers and sections to ensure optimal selection of modules, simple ground assembly, and relatively stable structure after lifting.

[0027] The steel structure is divided into upper and lower layers, consisting of portal-type modules and beam-type modules, which are assembled into modules on the ground. A layered and segmented hoisting process is used to hoist the assembled steel structure modules to the designated positions and install them.

[0028] Then, the secondary beams are installed to reduce the need for scaffolding during the installation process, thereby shortening the construction period and reducing costs.

[0029] Install main water pipe After the steel structure is inspected and accepted, the main water pipe of the circulating water system is installed. In this embodiment, the main water pipe has a maximum diameter of DN900 and a single weight of 0.934T. A 25-ton crane can meet the construction requirements. During the overall installation, a 50-ton crane is used depending on the location and working conditions. The crane lifts the main water pipe to the installation layer, inserts the pipe into the designated position, and sets up supports and fixing clamps according to the design drawings. Ensure that the pipe connections are tight and leak-free, and finally perform anti-corrosion treatment on the pipe. During anti-corrosion treatment, pay attention to the protection of the finished product, which can be achieved by laying three-proof cloth to prevent contamination of other components. Install top deck and railings All decks were categorized according to the design drawings, and the top deck was installed as a work platform for operators. Guardrails were installed to ensure the safety of operators. Install packing To install the packing layer inside the tower, the pre-fixed packing is transported to the bottom of the tower, and a forklift is used to lift the packing to the installation layer. The packing is then installed in the designated position according to the design drawings.

[0030] When the packing material meets the internal structure requirements, workers need to cut the packing material according to the actual site conditions, ensuring that the distance between blocks is ≤5mm. During installation, wooden boards should be laid on top of the packing material, and workers should stand on the boards to reduce pressure on the packing material. Standing directly on top of the packing material is strictly prohibited.

[0031] Install water distribution system Assemble the water distribution branch pipes and water distribution pipes according to the design drawings, and tighten the connection with bolts. The water distribution branch pipes are fixed to the steel structure with U-shaped clamps. Install the water distribution pipes and nozzles to ensure that water can be sprayed evenly on the packing layer.

[0032] Bracket for mounting motor and fan systems The installation of the support frame is a crucial step in the cooling tower installation process, as it affects the stability and operational efficiency of the entire system. The support frame must be installed according to the design requirements and fixed in its designated position. It is essential to ensure that the base is flat, stable, and in close contact with the steel structure. The main body of the support frame is then placed on the base, and its positioning and adjustments are made according to the design requirements to ensure that the support frame is installed securely, horizontally, and vertically.

[0033] Install air duct The wind turbine rings were assembled on the ground, and a cross-shaped suspension bracket was fabricated on site to install the wind duct. An 80-ton crane was used to lift the wind duct rings to the top installation position.

[0034] The scope of protection claimed by this invention is not limited to the specific embodiments described above. For those skilled in the art, this invention can have various modifications and alterations. Any modifications, improvements, and equivalent substitutions made within the concept and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A construction method for a split-type circulating water cooling tower group, characterized in that, include: Step 1: Fabricate anchor bolt fixing clamps, use the anchor bolt fixing clamps to position and fix the anchor bolts, and use measuring equipment and positioning algorithms to perform accuracy calibration; Step two: Divide the steel structure of the cooling tower into multiple modules, and complete the assembly, rust removal and anti-corrosion treatment of the modules on the ground; Step 3: Using a layered and segmented hoisting process, the steel structure modules assembled on the ground are hoisted to the predetermined positions and installed. Step four: On the completed steel structure, install the main circulating water pipe, the top deck and guardrail, the filler layer, the water distribution system, the motor and fan system support, and the ventilation duct in sequence.

2. The construction method for a split-type circulating water cooling tower group according to claim 1, characterized in that: In step one, the anchor bolt fixing clamp includes a channel steel frame and adjusting bolts. The channel steel frame includes crossbeams, longitudinal beams and side plates. At least two crossbeams and at least two longitudinal beams are perpendicularly connected. The ends of the crossbeams and longitudinal beams are perpendicularly connected to the side plates. The upper and lower flanges of the crossbeams and longitudinal beams are provided with fixing holes for anchor bolts to pass through. Adjustable connectors are provided on the side plates for fixing the anchor bolt fixing clamp to the concrete foundation column and fine-tuning its position.

3. The construction method for a split-type circulating water cooling tower group according to claim 2, characterized in that: The diameter of the fixing hole is φ26mm, and the connector is an M20×150mm adjusting bolt.

4. The construction method for a split-type circulating water cooling tower group according to claim 1, 2 or 3, characterized in that: In step two, the main steel structure of the cooling tower is divided into an upper module and a lower module along the height direction; wherein, the lower module adopts a portal-type module and the upper module adopts a beam-type module.

5. The construction method for a split-type circulating water cooling tower group according to claim 4, characterized in that: In step three, the lower-level portal frame module is hoisted first, and after it is aligned and fixed, the upper-level beam module is hoisted.

6. The construction method for a split-type circulating water cooling tower group according to claim 1 or 5, characterized in that: Step four involves transporting the filler blocks to the installation layer, laying load-bearing wooden boards on top of the filler, and having construction workers stand on the wooden boards to carry out the installation, ensuring that the gap between the filler blocks is ≤5mm.

7. The construction method for a split-type circulating water cooling tower group according to claim 6, characterized in that: In step four, the water distribution system is installed by fixing the water distribution branch pipes to the steel structure with U-shaped clamps, and then installing water distribution pipes and nozzles on the water distribution branch pipes to ensure that water can be sprayed evenly on the filler layer.

8. The construction method for a split-type circulating water cooling tower group according to claim 6, characterized in that: In step four, when installing the ventilation duct, a cross-shaped suspension bracket is made on-site to install the ventilation duct, and a crane is used to lift the ventilation duct to the top installation position.

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