Construction method for integrally assembling and then hoisting modularized tube bundle component of air cooling island

Abstract

The invention discloses a construction method for integrally assembling and hoisting modularized tube bundle components of an air cooling island. The construction method comprises the following steps: step 1, mounting a partition wall A-shaped frame; 2, the small tube bundle components are spliced into an inter-segment tube bundle integral component on the ground through a supporting frame tool; and step 3, hoisting the integral component of the internode tube bundle spliced in the step 2 to an A-shaped frame body by using a hoisting tool, and uniformly carrying out full welding on the internode tube bundles to connect the internode tube bundles into a whole, so that the installation of the modular tube bundle is completed. According to the construction method, the number of middle procedures is small, the number of used equipment is small, the construction period is effectively shortened, the construction cost is reduced, the working efficiency of workers in the construction process and the safety in the installation process are greatly improved, obvious economic benefits and safety benefits are achieved, and popularization is convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of air-cooling island construction methods in solar-thermal power generation projects, and relates to an air-cooling island modular tube bundle component integral assembly and hoisting construction method. Background Art

[0002] The existing method of installing the tube bundle on the A-frame of the air-cooling island is: first install the lower header of the tube bundle at the bottom of the A-frame, then use two cranes to lift the tube bundle and place it on the A-frame at the top of the air-cooling island for top butt welding, and weld the bottom to the lower header of the tube bundle into a whole. The existing conventional construction method has frequent lifting times, and the construction workers need to be at ultra-high altitudes for welding operations. The construction is difficult, has many construction processes, many construction machines, high construction costs, many factors affecting personal safety, low safety factors, low construction efficiency of high-altitude workers, and slow assembly and welding speed. Summary of the invention

[0003] The purpose of the present invention is to provide an air-cooling island modular tube bundle component integral assembly and re-hoisting construction method, which has the characteristics of fewer construction processes, less equipment used, high construction efficiency and high safety factor.

[0004] The technical solution adopted by the present invention is a method for integrally assembling and then hoisting modular tube bundle components of an air-cooling island, which is specifically implemented according to the following steps: Step 1, install the partition wall A-frame; Step 2, using a support frame tool to assemble the small tube bundle components on the ground into an internode tube bundle integral component; Step 3, use the lifting tool to lift the inter-section tube bundle integral component assembled in step 2 to the A-type frame, and uniformly weld all the inter-section tube bundles to connect them into a whole, thus completing the installation of the tube bundle.

[0005] The present invention is also characterized in that: Step 1 is as follows: Assemble the partition wall into an A shape on the ground, install its internal horizontal support, and then hoist each piece onto the platform for installation. After the A-frame is installed in place, measure its verticality with a theodolite. If it is not straight, adjust the guy rope. Tighten the guy rope to make the A-frame vertical, lock the fall chain and weld it. After each row of A-frames is installed and adjusted as qualified, install the A-frame connecting beam to connect the partition wall into a whole, and then install the track beam.

[0006] First install the end of each fan row and the partition wall separating the downstream tube bundle and the upstream tube bundle.

[0007] The support frame tooling is a horizontally placed triangular prism frame structure, which is made of H-shaped steel as a whole. Two cross-arranged first support rods are installed on the two rectangular frames on its side, and horizontally set second support rods are installed on the two triangular frames on its side. The second support rods are installed in the middle position of the triangular frames.

[0008] Step 2 is as follows: Before the small tube bundle components are sent to the construction site, the tube bundles and the tube bundle lower headers are welded into a whole; after being sent to the construction site, the small tube bundle components are assembled using the tube bundle support frame tooling installed on the ground: the tube bundle is lifted and placed on the quadrilateral frame on the side of the support frame tooling, the support of the exhaust duct walkway is installed, and the above steps are repeated to place the tube bundles one by one, and the top of the tube bundle is connected with a V-shaped connecting plate, that is, the tube bundle components of each intersection are assembled; then, a number of U-shaped buckle groove plates are installed on the inside and outside of the intersection tube bundle components to fix them, and finally, two ear plates for lifting are welded near the edge of the top of each side of the tube bundle and lifting holes are opened, and two ear plates for lifting are welded near the edge of the tube bundle lower header at the bottom of each side of the tube bundle and lifting holes are opened.

[0009] The lifting tooling includes a longitudinal steel section, on which four transverse steel sections are vertically arranged, two of which are arranged at the two ends of the longitudinal steel section, and the other two are arranged near the midpoint of the longitudinal steel section, and the four transverse steel sections are symmetrically arranged with the radial center line of the longitudinal steel section as the symmetry axis; two end faces of the transverse steel section are provided with two lifting holes, which are distributed up and down.

[0010] The length of the longitudinal steel section is consistent with the horizontal length of the assembled inter-section tube bundle integral component, and the length of the transverse steel section is consistent with the width of the inter-section tube bundle integral component.

[0011] The positions of a total of eight end points of the four transverse steel sections correspond one by one to the positions of eight ear plates of the inter-node tube bundle integral component.

[0012] Step 3 is as follows: After the assembly of the inter-segment tube bundle integral component is completed, use a crane to lift it to the A-type frame through a lifting tool for installation; during lifting, use wire ropes to connect the eight lifting holes below the four transverse steel sections on the lifting tool with the eight ear plates on the inter-segment tube bundle integral component one by one, and use wire ropes to connect the eight lifting holes above the four transverse steel sections on the lifting tool with the hooks of the crane; lift and install all inter-segment tube bundles in turn, and then fully weld each inter-segment tube bundle to connect them into a whole, and the installation of the tube bundle is completed.

[0013] The beneficial effects of the present invention are: (1) The construction method of the present invention adopts the idea of ​​integrating parts into a whole and integrating modules, and transfers a large amount of assembly, docking and welding work of the pipe bundle from a height of 30m to the ground. Then, the assembled inter-section pipe bundle is hoisted as a whole to the A-frame. The construction efficiency of the operators is significantly improved, and personal safety is effectively guaranteed. The number of times a large number of pipe bundle components are butt-welded at high altitude is reduced (the number of times of butt-welding of pipe bundles at high altitude can be reduced to 2%-3% of the original workload), and the process of using two cranes for docking and welding at high altitude is reduced. The high-altitude operation time is greatly reduced, and the operation safety factor is improved. During the construction period, only one crane is needed to complete the hoisting operation, which saves the construction period and the total investment in machinery and human resources, and achieves cost reduction and efficiency improvement. (2) By adopting the construction method of the present invention, the tube bundle and the lower header of the tube bundle can be welded into a whole in advance in the factory and sent to the site, thereby reducing the process of butt welding the lower header of the tube bundle and the tube bundle at high altitude and shortening the on-site construction period; (3) The pipe bundle support frame fixture and lifting fixture used in the construction method of the present invention have simple structures and reasonable structural design. Through theoretical calculation of the bearing capacity and deformation of the two fixture structures and on-site construction verification, the overall structural stability of the two fixtures is good during use, and the fixture structures are not deformed, which can meet the on-site construction requirements; (4) The construction method of the present invention has fewer intermediate processes and uses less equipment, which effectively saves construction time, reduces construction costs, greatly improves the work efficiency of personnel during the construction process and the safety during the installation process, has obvious economic and safety benefits, and is easy to promote; (5) The concept of the construction method of the present invention is also applicable to the construction of various modular steel structures and components that can be hoisted to high altitudes for installation by cranes, and can be achieved by rationally designing and manufacturing various tooling on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a flow chart of the method of the present invention; Figure 2 It is a structural schematic diagram of the support frame tooling in the method of the present invention; Figure 3 It is a structural schematic diagram of the lifting tooling in the method of the present invention; Figure 4 is a side view of the lifting tool in the method of the present invention; Figure 5 It is a schematic diagram of the structure after the A-frame is installed in the method of the present invention; Figure 6 It is a schematic diagram of the structure after the tube bundle is assembled on the support frame tooling in the method of the present invention; Figure 7 It is a schematic diagram of the hoisting method of the internode tube bundle integral component in the method of the present invention; Figure 8 It is a front view of the hoisting mode of the integral component of the internode tube bundle in the method of the present invention; Fig. 9 It is a structural schematic diagram of the tube bundle being hoisted and placed in place on the A-frame in the method of the present invention.

[0015] In the figure, 1. first support rod, 2. transverse steel, 3. longitudinal steel, 4. hanging hole, 5. tube bundle, 6. U-shaped buckle groove plate, 7. ear plate, 8. lower connecting box, 9. support frame tooling, 10. second support rod. DETAILED DESCRIPTION

[0016] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Embodiment 1: The air-cooling island modular tube bundle component integral assembly and hoisting construction method of the present invention has the following process: Figure 1 As shown, the small components of the tube bundle are first assembled and welded on the ground using the support frame tooling to form the inter-section tube bundle integral components, so that a large amount of assembly, docking and welding work is carried out on the ground. After the assembly of the integral tube bundle components of each section is completed, the lifting tooling is used to lift the integral tube bundle components to the A-frame at the top of the air-cooling island and weld them in place, and then this operation is repeated until the tube bundles on all the A-frames are installed.

[0018] Embodiment 2: On the basis of Example 1, before the tube bundle and the lower header of the tube bundle are delivered to the site, the manufacturer is guided to weld the tube bundle and the lower header of the tube bundle into a whole and send them to the site through optimized working method ideas, which can reduce the process of welding the tube bundle and the lower header on site and the process of welding the lower header of the tube bundle to the bottom of the A-frame first.

[0019] Embodiment 3: Based on Example 2, the structure of the support frame tooling is as follows: Figure 2 As shown, it is a horizontally placed triangular prism frame structure, which is made of H-shaped steel as a whole. Two cross-arranged first support rods 1 are installed on the two rectangular frames on its side, and horizontally arranged second support rods 10 are installed on the two triangular frames on its side. The second support rods 10 are installed in the middle position of the triangular frames.

[0020] Embodiment 4: Based on Example 3, the structure of the lifting tool is as follows: Figure 3 and Figure 4As shown, it includes a longitudinal steel 3 and four transverse steels 2. The four transverse steels 2 are vertically fixed on the longitudinal steel 3, two of which are respectively arranged at the two ends of the longitudinal steel 3, and the other two are arranged near the midpoint of the longitudinal steel 3, and the four transverse steels 2 are symmetrically arranged with the radial center line of the longitudinal steel 3 as the symmetry axis. Two hanging holes 4 are opened on the two end faces of the transverse steel 2. The two hanging holes 4 are distributed up and down for hanging steel wire ropes. The upper hanging hole 4 is hung on the crane hook through the steel wire rope, and the lower hanging hole 4 is hung on the assembled pipe bundle integral component through the steel wire rope. Eight ear plates for lifting are arranged on the pipe bundle integral component assembled on the ground, and the positions of the eight ear plates correspond to the positions of the total eight end points of the four transverse steels 2 on the lifting tool. The length of the longitudinal steel 3 is consistent with the horizontal length of the assembled inter-section pipe bundle integral component, and the width of the transverse steel 2 is consistent with the width of the inter-section pipe bundle integral component.

[0021] Embodiment 5: On the basis of Example 4, the modular tube bundle component of the air-cooling island of the present invention is assembled and then hoisted. Figure 1 As shown, the specific implementation steps are as follows: Step 1: Install the partition wall A-frame Assemble the partition wall into an A shape on the ground, install its internal horizontal support, and then hoist each piece onto the platform for installation. After the A-frame is installed in place, measure its verticality with a theodolite. If it is not straight, adjust the guy rope, tighten the guy rope to make the A-frame vertical, lock the fall chain and weld it. After each row of A-frames is installed and adjusted as qualified, install the A-frame connecting beam to connect the partition wall into a whole, and then install the track beam. The partition walls at the end of each fan row and the separation area of ​​the downstream tube bundle and the upstream tube bundle should be installed first. The installation of the partition wall is carried out one by one with the installation of each group of radiators. The structure of the installed A-frame is as follows. Figure 5 shown.

[0022] Step 2: Assemble the small tube bundle components into the inter-section tube bundle integral component The tube bundle is placed in a horizontal position when delivered, and is equipped with lifting lugs at both ends. The tube bundle and the lower header of the tube bundle are welded into a whole according to the site requirements.

[0023] like Figure 6As shown, the small tube bundle components are spliced ​​into the inter-section tube bundle integral components by the tube bundle support frame tooling 9 set on the ground. The tube bundle 5 is lifted and placed on the quadrilateral frame on the side of the support frame tooling 9, and the support of the exhaust duct walkway is installed. The above steps are repeated to place the tube bundles 5 one by one, and the top of the tube bundle is connected with a V-shaped connecting plate. After assembling the tube bundle components of each inter-section, the tube bundle is fixed with U-shaped buckle groove plates 6 on the inside and outside of the tube bundle. A number of U-shaped buckle groove plates 6 for fixing are set on each side, and the U-shaped buckle groove plates 6 on the inside and outside of each tube bundle are fixed with bolts. In addition, two ear plates 7 for lifting are welded near the edge of the top of each tube bundle and the lifting holes are opened. At the bottom of the tube bundle, two ear plates 7 for lifting are welded near the edge on the lower header 8 of each tube bundle and the lifting holes are opened. The positions of these eight ear plates correspond one by one to the positions of the eight end points of the four transverse steel sections 2 on the lifting tooling.

[0024] Step 3: Install the tube bundle After the inter-section tube bundle is assembled, it is hoisted to the A-frame using a crane and a hoisting tool for installation. Figure 7 and Figure 8 As shown, during the hoisting, the eight lifting holes 4 below the four transverse steel sections 2 on the lifting tool are connected one by one with the eight ear plates 7 on the inter-section tube bundle integral component by steel wire ropes, and the eight lifting holes 4 above the four transverse steel sections 2 on the lifting tool are connected with the hook of the crane by steel wire ropes. All inter-section tube bundles are hoisted and installed in sequence, and then all inter-section tube bundles are uniformly fully welded to connect them into a whole, that is, the installation of the tube bundle is completed. After the installation is completed, the status of the tube bundle and the A-frame is as follows: Fig. 9 shown.

[0025] Embodiment 6: This embodiment takes the installation of a 100MW solar thermal project air-cooled island as an example. The steel structure platform is 47.58 meters long and 37.81 meters wide, divided into 7 axes and 6 cables. There are 12 wind turbines, and one side of the platform is cantilevered. The platform is cantilevered with a 1.45-2m wide walkway around it, and the walkway is surrounded by windbreak walls with a height of about 11 meters.

[0026] The A-frames are arranged in an east-west direction in this project, with a total of 4 rows. A total of 1,170 tube bundles are installed on each row of A-frames. Each row of A-frames is 33.96m long. A total of 4,680 tube bundles are installed on the 4 rows of A-frames. The tube bundles and their lower headers are 10.15m long. Each tube bundle is 20cm wide and 6cm high. The hoisting installation height of the tube bundle is 18m-30m. The A-frame is installed before the installation of the tube bundle, and the angle steel fixing the color steel plate is welded to the steel section on site.

[0027] The structure of the support frame tooling used in this project is as follows: the tooling material is H-shaped steel 20×20×1.2cm, the bottom quadrilateral of the triangular prism frame is 10.6m long and 2.2m wide; the other two sides of the side triangle are 10.14m long, and the middle horizontal support rod of the triangle is set in the middle with a total of 2 lengths of 5.3m, and the overall height of the tooling is 50cm. The support frame tooling is designed for the overall components of the 2.2m-interval tube bundle, including but not limited to this specification, and can be flexibly assembled according to the actual situation on site. This project is based on the crane model on site and the 30-meter hoisting height combined with previous construction experience. It is most convenient to assemble it into a 2.2m integrated tube bundle specification for construction.

[0028] The lifting fixture is composed of 4 2.2m long transverse steel sections and 1 10.6m long longitudinal steel section, one at each end and one 5.1m away from the end. The steel sections that make up the whole component are fully welded. The lifting fixture is designed for the whole component of the tube bundle with a 2.2m interval, including but not limited to the structural dimensions. The lifting fixture is customized to fit the spliced ​​tube bundle components.

[0029] The tube bundle is assembled on the ground through the support frame tooling with a width of 2.2m. After the tube bundle components of each section are assembled, the tube bundle is fixed with U-shaped buckle groove plates (wing plate and width are both 2cm) inside and outside the tube bundle every 2.5m. Three U-shaped buckle groove plates for fixing are set on each side. The U-shaped buckle groove plates inside and outside the tube bundle on each side are fixed with bolts at an interval of 24cm. In addition, two ear plates for lifting are welded at a distance of 15cm from the edge on the top of each tube bundle and the lifting holes are opened. At the bottom of the tube bundle, two ear plates for lifting are welded at a distance of 15cm from the edge on the lower header of each tube bundle and the lifting holes are opened. The positions of these eight ear plates correspond to the positions of the eight end points of the four transverse steel sections on the lifting tooling.

[0030] The assembled tube bundles are hoisted to the A-frame of the air-cooling island by a crane using a lifting tool. After the tube bundles of each row of A-frames are assembled and welded, they are divided into 15 sections for hoisting construction. There are 60 sections in 4 rows for hoisting batches, which reduces the original 2,340 times of butt welding work at high altitude to 56 times. Through the improvement and innovation of the construction method, the method of the present invention can complete the construction task of assembling and hoisting 9 sections per day, and the installation of a total of 60 sections of tube bundles on 4 rows of A-frames can be completed in 7 days. The conventional construction method uses 2 cranes for high-altitude butt welding of tube bundles, which requires at least 15 days of construction period. The use of this construction method can save about 54% of the construction period, and only one crane is needed to complete the installation of the tube bundles, and the total human resource investment is also saved by 54%. In addition, the construction method of the present invention saves at least 23 days of crane rental costs (compared with 2 cranes) and at least 8 days of human resource investment for a team (each team is equipped with 11 people). The innovative idea of ​​this construction method is also applicable to the construction of various modular components hoisted by cranes. The idea of ​​innovative application of construction methods has a wide range of applications and can solve the construction of many such large-scale modular structures, components, and steel structures, thereby achieving the goal of reducing costs and increasing efficiency while improving the safety benefits of personnel construction.

Claims

1. The overall assembly and hoisting construction method of modular tube bundle components of air cooling island is characterized by: Follow the steps below to implement it: Step 1, install the partition wall A-frame; Step 2, using a support frame tool to assemble the small tube bundle components on the ground into an internode tube bundle integral component; Step 3, use the lifting tool to lift the inter-section tube bundle integral component assembled in step 2 to the A-type frame, and uniformly perform full welding on each inter-section tube bundle to connect them into a whole, thus completing the installation of the tube bundle.

2. The method for integrally assembling and then hoisting modular tube bundle components of an air-cooling island according to claim 1 is characterized in that: Step 1 is as follows: Assemble the partition wall into an A shape on the ground, install its internal horizontal support, and then hoist each piece onto the platform for installation. After the A-frame is installed in place, measure its verticality with a theodolite. If it is not straight, adjust the guy rope. Tighten the guy rope to make the A-frame vertical, lock the fall chain and weld it. After each row of A-frames is installed and adjusted as qualified, install the A-frame connecting beam to connect the partition wall into a whole, and then install the track beam.

3. The method for integrally assembling and then hoisting modular tube bundle components of an air-cooling island according to claim 2 is characterized in that: First install the end of each fan row and the partition wall separating the downstream tube bundle and the upstream tube bundle.

4. The method for integrally assembling and then hoisting modular tube bundle components of an air-cooling island according to claim 1 is characterized in that: The support frame tooling is a horizontally placed triangular prism frame structure, which is made of H-shaped steel as a whole, and two cross-arranged first support rods (1) are installed on the two rectangular frames on its side, and two horizontally arranged second support rods (10) are installed on the two triangular frames on its side, and the second support rods (10) are installed in the middle position of the triangular frames.

5. The method for integrally assembling and then hoisting modular tube bundle components of an air-cooling island according to claim 4 is characterized in that: Step 2 is as follows: Before the small-sized pipe bundle components are sent to the construction site, the pipe bundle (5) and the pipe bundle lower header (8) are welded into a whole. After being sent to the construction site, the small-sized pipe bundle components are assembled using a pipe bundle support frame tooling installed on the ground: the pipe bundle (5) is lifted and placed on a quadrilateral frame on the side of the support frame tooling, and the support of the exhaust duct walkway is installed. After repeating the above steps to place the pipe bundles (5) one by one, the top of the pipe bundle (5) is connected with a V-shaped connecting plate, that is, the pipe bundle components of each inter-section are assembled. Then, a plurality of U-shaped buckle groove plates (6) are installed inside and outside the inter-section pipe bundle components to fix them. Finally, two ear plates (7) for lifting are welded near the edge of the top of each side pipe bundle and lifting holes are opened. Two ear plates (7) for lifting are welded near the edge of the pipe bundle lower header (8) at the bottom of each side pipe bundle and lifting holes are opened.

6. The method for integrally assembling and then hoisting modular tube bundle components of an air-cooling island according to claim 5 is characterized in that: The lifting tool comprises a longitudinal steel section (3), four transverse steel sections (2) are vertically arranged on the longitudinal steel section (3), two of which are arranged at two ends of the longitudinal steel section (3), and the other two are arranged near the midpoint of the longitudinal steel section (3), and the four transverse steel sections (2) are symmetrically arranged with the radial center line of the longitudinal steel section (3) as the symmetry axis; two end surfaces of the transverse steel section (2) are each provided with two lifting holes (4), and the two lifting holes (4) are distributed up and down.

7. The method for integrally assembling and then hoisting modular tube bundle components of an air-cooling island according to claim 6 is characterized in that: The length of the longitudinal steel section (3) is consistent with the horizontal length of the assembled inter-section tube bundle integral component, and the length of the transverse steel section (2) is consistent with the width of the inter-section tube bundle integral component.

8. The method for integrally assembling and then hoisting modular tube bundle components of an air-cooling island according to claim 6 is characterized in that: The positions of a total of eight end points of the four transverse steel sections (2) correspond one by one to the positions of eight ear plates (7) of the inter-node tube bundle integral component.

9. The method for integrally assembling and then hoisting modular tube bundle components of an air-cooling island according to claim 6 is characterized in that: Step 3 is as follows: After the inter-segment tube bundle integral component is assembled, it is lifted and transported to the A-frame body by a crane through a lifting tool for installation; during lifting, the eight lifting holes (4) below the four transverse steel sections (2) on the lifting tool are connected one by one with steel wire ropes to the eight ear plates (7) on the inter-segment tube bundle integral component, and the eight lifting holes (4) above the four transverse steel sections (2) on the lifting tool are connected to the hook of the crane by steel wire ropes; all inter-segment tube bundles are lifted and installed in sequence, and then all inter-segment tube bundles are uniformly fully welded to connect them into a whole, thus completing the installation of the tube bundle.

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