Large static tower inverted installation device and inverted construction method

Abstract

The present invention provides a large static tower upside-down installation device and an upside-down construction method. In the upside-down installation device, side columns are arranged on a base; a lifting device is arranged on the side columns, and the lifting device is used to lift the tower wall panels. A limiting plate is arranged on the base, and the limiting plate is located inside the tower wall panel to be installed during use. After a layer of tower wall panel is welded on the upside-down installation device, the tower wall panel is lifted by the lifting device, which facilitates the installation of the next layer of tower wall panel under the lifted tower wall panel. There is no need to use a large crane to install a large static tower, saving space. The welding operations of the tower wall panels are all completed on the upside-down installation device, that is, the welding operations are completed on the ground, avoiding working at high altitudes. This not only ensures the personal safety of the operators, but also has higher efficiency in ground operations compared to high-altitude operations. This shortens the installation construction period of the large static tower and improves the installation efficiency of the large static tower.

Description

Technical Field

[0001] The invention belongs to the technical field of the assembly of large static towers, and particularly relates to an inverted installation device and an inverted construction method for large static towers. Background Art

[0002] Large static towers are cylindrical welded structure devices commonly used in thermal power plants, chemical plants and heat source plants for storage, pressure equalization, exchange, reaction and filtration. The conventional installation process includes foundation acceptance, placing sole plates, hoisting and aligning the lowermost section of the tower body, hoisting the second section of the tower body from bottom to top, welding the circumferential gap between the two sections of the tower body, repeating the process of hoisting the tower body and welding the inter - segment welds until the uppermost tower body, installing the top plate, overall alignment of the static tower, and installation and welding of internal equipment.

[0003] However, the above - mentioned installation process requires a large crane during construction and must have a large construction space, which makes it impossible to install large static towers in places with limited space. Moreover, during the above - mentioned installation process, as the hoisting height increases during the installation of the static tower, subsequent assembly and welding operations are all carried out at high altitude. The risk factor of high - altitude operation is relatively large. Compared with ground operation, high - altitude operation is more difficult, time - consuming and longer. This also makes the installation construction period of large static towers longer and the cost higher.

[0004] Therefore, an improved technical solution is needed to address the deficiencies of the above - mentioned existing technologies. Summary of the Invention

[0005] The purpose of the present invention is to provide an inverted installation device and an inverted construction method for large static towers, so as to solve at least the problem that it is impossible to install large static towers in places with limited space at present.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] An inverted installation device for large static towers, the inverted installation device includes

[0008] A base, the base is used as the installation foundation of the inverted installation device;

[0009] Side columns, the side columns are arranged on the base;

[0010] Lifting equipment, the lifting equipment is arranged on the side columns, and the lifting equipment is used to lift the tower wall plate of the static tower;

[0011] Limit plates, the limit plates are arranged on the base, the limit plates are located outside the side columns, and the limit plates are located inside the tower wall plate to be installed during use and limit the tower wall plate to be installed.

[0012] For the large static tower upside-down installation device as described above, as a preferred solution, a plurality of side columns are provided, and the positions of the side columns are located on the circumference of the same circle. A connecting rod is provided between the side columns, and both ends of the connecting rod are fixedly connected to the corresponding side columns.

[0013] For the large static tower upside-down installation device as described above, as a preferred solution, the quantity calculation of the side columns and the lifting equipment is determined by the following formula:

[0014] n = P max / Q (Formula 1)

[0015] In the formula: n is the quantity of side columns and lifting equipment required;

[0016] P max is the maximum lifting weight of the upside-down installation device;

[0017] Q is the rated load-bearing capacity of the lifting equipment.

[0018] For the large static tower upside-down installation device as described above, as a preferred solution, the following formula is used for determination:

[0019] P max = K × (P G + P 附 ) (Formula 2)

[0020] P G is the maximum weight of the tower wall panels;

[0021] P 附 is the weight of accessories such as the internal reaction device of the tower;

[0022] K is the dynamic load coefficient, taking 1.3.

[0023] The present invention also provides a large static tower upside-down construction method, and the specific technical solution is as follows:

[0024] The large static tower upside-down construction method includes the following steps:

[0025] Step S1, construction preparation, on-site measurement and layout, draw the guiding line of the tower wall panel position according to the diameter of the tower body;

[0026] Step S2, determine the quantity of side columns and lifting equipment, and assemble the upside-down installation device;

[0027] Step S3, weld the wall panel monomers to form the top layer wall panel, and then lift the top layer wall panel through the lifting equipment;

[0028] Step S4, place two wall panel monomers under the top layer wall panel and weld them to form the second layer wall panel, and weld the second layer wall panel to the top layer wall panel;

[0029] Step S5: Install the top plate, and circumferentially weld the top plate to the upper end of the top-layer wall panel.

[0030] Step S6: Lift the welded second-layer wall panel and the top-layer wall panel by a hoisting device, and weld the tower wall panels from the third layer to the second-to-last layer to the whole formed by the second-layer wall panel and the top-layer wall panel according to the operation process of Step S4.

[0031] Step S7: Lift the prefabricated internal reaction device of the tower into the tower from the bottom of the tower and install it at the designated position.

[0032] Step S8: Weld the bottom-layer wall panel below the second-to-last layer wall panel.

[0033] Step S9: Perform flaw detection and water filling test on the welded tower.

[0034] For the above-mentioned large-scale stationary tower reverse installation construction method, as a preferred solution, in Step S2, weld and install the determined number of side columns on the base, install hoisting devices on each side column, fixedly set connecting rods between the side columns, and both ends of the connecting rods are fixedly connected to the corresponding side columns respectively. Install a limiting plate on the base, and the radius of curvature of the limiting plate is equal to the inner diameter of the tower.

[0035] For the above-mentioned large-scale stationary tower reverse installation construction method, as a preferred solution, Step S3 is specifically as follows: Lift two wall panel monomers onto the base of the reverse installation device, tighten them with steel wires around the periphery of the wall panel monomers. There are two longitudinal gaps between the two wall panel monomers. First, spot-weld the longitudinal gaps, weld one of the longitudinal gaps from top to bottom. Weld the outside of the longitudinal gap first, and then weld after root cleaning on the inside. After one weld seam is welded, measure the perimeter of the wall panel. After the measurement result meets the requirements, then weld the other longitudinal gap. The two wall panel monomers are welded to form the top-layer wall panel. Hook the hoisting device to the lifting lugs inside the top-layer wall panel. When the top-layer wall panel is lifted to the predetermined height by the hoisting device, lock the hoisting device to maintain the lifting height of the top-layer wall panel.

[0036] For the above-mentioned large-scale stationary tower reverse installation construction method, as a preferred solution, Step S4 is specifically as follows: After the top-layer wall panel is lifted to the predetermined height, place two wall panel monomers below the top-layer wall panel. The two wall panel monomers located below the top-layer wall panel form the second-layer wall panel. First, weld one of the two longitudinal weld seams in the second-layer wall panel, leaving the other longitudinal gap as a live gap without welding. Then weld the circumferential gap between the second-layer wall panel and the top-layer wall panel. When the circumferential gap is welded to both sides of the live longitudinal gap, weld the live longitudinal gap, and finally complete the closed welding of the circumferential gap.

[0037] For the large static tower inverted construction method as described above, as an optimized solution, step S6 is specifically as follows: Hang the hook of the lifting equipment on the lifting lug inside the second layer of wall panels, lift the top layer of wall panels and the second layer of wall panels welded together, place two single wall panels under the second layer of wall panels, and weld the tower wall panels from the third layer to the second-to-last layer together according to the operation process of step S4; Weld the first layer of wall panels, and lift the welded wall panels through the lifting equipment to weld the next layer of wall panels under the lifted wall panels.

[0038] For the large static tower inverted construction method as described above, as an optimized solution, after the internal reaction device of the tower is installed and tested qualified, weld the bottom layer of wall panels according to the installation method of the wall panels, and weld the bottom layer of wall panels under the second-to-last layer of wall panels. The circumferential inner and outer corner gaps between the bottom layer of wall panels and the bottom plate adopt the segmented backstep welding method, and each section of the gap is welded simultaneously in the same direction.

[0039] Compared with the closest prior art, the technical solution provided by the present invention has the following excellent effects:

[0040] After the first layer of tower wall panels is welded on the inverted installation device, the tower wall panels are lifted by the lifting equipment in the inverted installation device, so as to facilitate the installation of the next layer of tower wall panels under the lifted tower wall panels. In this way, there is no need to use a large crane to install the large static tower, saving the space for placing the crane on site and realizing the installation of the large static tower in a limited space. Moreover, the welding operation of the tower wall panels in the large static tower is completed on the inverted installation device, that is, on the ground, which also avoids working at high altitude. This not only ensures the personal safety of the operators, but also has higher working efficiency on the ground compared with working at high altitude, thus shortening the installation construction period of the large static tower and improving the installation efficiency of the large static tower.

[0041] This inverted construction method avoids setting large machinery for hoisting operations in the factory area, saves the consumption of energy such as diesel and eliminates the noise pollution of mechanical operations. Since there is no need to demolish the walls between equipment rooms, the generation of construction waste is reduced, environmental pollution is not caused, which meets the requirements of green construction specifications, reduces the construction cost and improves the economic benefits.

[0042] Compared with the traditional direct installation method, this construction method not only does not need to use large machinery, saves the construction period, saves a large amount of manpower and material resources consumption, but also does not need to work at high altitude, improving the safety guarantee during the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a partial structural diagram of the inverted installation device in the embodiment of the present invention;

[0044] Figure 2The top view of the top wall panel installed on the upside-down installation device in the embodiment of the present invention;

[0045] Figure 3 The schematic diagram when the top wall panel is installed in the embodiment of the present invention;

[0046] Figure 4 The schematic diagram of the upside-down installation device lifting the top wall panel in the embodiment of the present invention;

[0047] Figure 5 The schematic diagram of the welding installation of the second-layer wall panel and the top wall panel in the embodiment of the present invention;

[0048] Figure 6 The flowchart of the upside-down construction method in the embodiment of the present invention.

[0049] In the figure: 1, base; 2, side column; 3, limit plate; 4, connecting rod; 5, chain block; 10, top wall panel; 20, second-layer wall panel. Specific embodiments

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0051] In the description of the present invention, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0052] Next, the present invention will be described in detail with reference to the drawings and in conjunction with the embodiments. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0053] According to the specific embodiment of the present invention, as Figures 1-5As shown in the figure, the present invention provides a large-scale static tower upside-down installation device. The upside-down installation device includes a base 1, side columns 2, and a lifting device. The lifting device is a manual hoist 5. The base 1 serves as the installation foundation for the entire upside-down installation device. The side columns 2 are welded to the installation base 1. The manual hoist 5 is arranged on the side columns 2 and is used to lift the wall panels of the static tower. After the welding of one layer of the wall panels of the tower is completed on the upside-down installation device, the lifting device in the upside-down installation device lifts one layer of the wall panels of the tower, thus facilitating the installation of the next layer of the wall panels of the tower under the lifted wall panels of the tower. In this way, there is no need to use a large crane to install the large-scale static tower, saving the space for placing the crane on-site and realizing the installation of the large-scale static tower in a limited space. Moreover, the welding operations of the wall panels of the tower in the large-scale static tower are all completed on the upside-down installation device, that is, the welding operations are completed on the ground, which also avoids working at high altitudes. This not only ensures the personal safety of the operators but also has a higher working efficiency on the ground compared with working at high altitudes. This shortens the installation construction period of the large-scale static tower and improves the installation efficiency of the large-scale static tower.

[0054] A limiting plate 3 is arranged on the base 1. The limiting plate 3 is located outside the side columns 2 and is located inside the wall panels of the tower to be installed during use and limits the wall panels of the tower to be installed. The limiting plate 3 is welded by a 10-mm-thick arc-shaped steel plate. The radius of curvature of the limiting plate 3 is equal to the inner diameter of the wall panels of the tower. The height of the limiting plate 3 is 500 mm. When installing the wall panels of the tower, steel wires are tightened longitudinally at the upper and lower openings of the periphery of the wall panels of the tower. The limiting plate 3 plays a limiting role inside the wall panels of the tower to prevent the wall panels of the tower from deforming due to the tightening of the periphery.

[0055] Furthermore, there are 6 side columns 2. The positions of the 6 side columns 2 are located on the circumference of the same circle. The diameter of the circle where the side columns 2 are located is smaller than the inner diameter of the tower body of the static tower. A manual hoist 5 is arranged on each side column 2, and the model of the manual hoist 5 is HS-5.0. A connecting rod 4 is arranged between two side columns 2 located on the same diameter. The two ends of the connecting rod 4 are respectively fixedly connected to the corresponding side columns 2. The connecting rod 4 plays a role in strengthening the overall structural strength of the upside-down installation device. Both the side columns 2 and the connecting rod 4 are made of seamless steel pipes with a diameter of 159 mm and a wall thickness of 6 mm.

[0056] Furthermore, the calculation of the number of side columns 3 and manual hoists 5 is determined by the following formula:

[0057] n = P max / Q (Formula 1)

[0058] In the formula: n is the number of side columns and lifting devices required, unit: piece;

[0059] P max is the maximum lifting weight of the upside-down installation device, unit: ton (t);

[0060] Q is the rated load capacity of the lifting equipment, unit: ton (t).

[0061] Among them, P in Formula 1 max is determined by the following formula:

[0062] P max = K × (P G + P 附 ) (Formula 2)

[0063] P G is the maximum lifting weight of the tower wall panel, unit: ton (t);

[0064] P 附 is the weight of accessories such as the internal reaction device of the tower body, unit: ton (t);

[0065] K is the dynamic load coefficient, taking 1.3.

[0066] For example, in the embodiment of this project:

[0067] P G = 3.14 × 5 × 19 × 0.01 × 7.93 = 23.66t

[0068] P 附 = 20.5t

[0069] P max = 1.3 × (23.66 + 20.5) = 57.4t

[0070] Considering the balance of the lifting points and the simplicity of the operation of the lifting equipment, a manual chain hoist with Q = 10t is adopted.

[0071] Therefore, n = 57.4 / 10 = 5.74. To ensure the safety of equipment lifting, n is taken as 6.

[0072] According to the calculation results, 6 side columns 2 and manual chain hoists 5 are evenly installed on the base 1.

[0073] The present invention also provides an inverted construction method using the above-mentioned inverted installation device, such as Figures 3-6As shown in the figure, this construction method is applicable to the installation of stationary tower equipment with a cylindrical welded structure, especially suitable for the installation of large stationary tower equipment with a cylindrical welded structure indoors or in a space without hoisting machinery operation. The technological principle of this construction method is as follows: Install the reverse installation device on the inner side of the position of the tower wall plate to be installed. Utilize the side columns 2 evenly installed on the inner side of the tower wall plate, install chain hoists 5 on the side columns 2, and start installing from the topmost layer of the tower wall plate. After installing the first layer, use the chain hoist 5 to lift the first layer of the wall plate to a predetermined height, then weld the second layer of the wall plate 20 to the first layer of the wall plate, and complete the welding of the tower top and the first layer of the wall plate. Then lift the installed wall plate and the tower top again, install the third layer of the wall plate, and repeat the construction in this way. Before welding the bottommost layer of the wall plate, send the reaction device inside the tower into the tower from the bottom of the tower for hoisting, and finally weld the bottommost layer of the wall plate to complete the reverse installation of the large stationary tower. The specific steps of this reverse installation construction method are as follows:

[0074] Step S1, construction preparation, on-site measurement and setting out, draw the guiding lines for the position of the tower wall plate on-site according to the diameter of the tower. Step S1 includes the following steps:

[0075] Step S101, technical preparation

[0076] Technical preparation includes: reviewing the drawings, compiling the construction plan and operation instructions, and conducting technical disclosure and pre-job training for on-site construction personnel.

[0077] Step S102, on-site preparation

[0078] 1) Fabricate 40m of Ф159×6mm seamless steel pipes for the side columns 2 and cut them according to the height of the side columns 2. Prepare 6 sets of 10t chain hoists to be used as lifting equipment, and check whether there are any problems such as chain jamming or malfunction in the lifting chain and gear transmission mechanism.

[0079] 2) The height of the desulfurization tower equipment (i.e., the large stationary tower) is 19.5m, which is divided into 12 layers of annular wall plates and 1 layer of tower top. The height of each layer is 1.5m. Each layer of the wall plate is composed of two semi-circular wall plate monomers, and the thickness of the wall plate monomer is 10mm. The semi-circular wall plates are processed from 316L stainless steel coils by a rolling machine and then transported to the installation site. After arrival, check whether the thickness and curvature of the wall plates meet the design requirements.

[0080] 3) Prepare construction electricity, and check whether the power supply and distribution system meet the requirements of three-level power distribution and two-level protection.

[0081] Step S103, measurement and setting out

[0082] According to the drawings, the center coordinates of the desulfurization tower equipment are given, and the center position of the tower body is located using a total station. The zero scale of the steel ruler is placed on the center point, and the circular position of the tower wall is drawn on site according to the diameter of the tower body. Before the actual installation of the inverted installation device, the desulfurization tower body given in the drawings is re-measured according to the absolute distance between the equipment and the building.

[0083] Step S2, determining the number of side columns 2 and lifting equipment, and assembling the inverted installation device, wherein the lifting equipment is a hand chain hoist 5.

[0084] Specifically, the number of side columns 2 and hand chain hoists 5 is calculated using the following formula:

[0085] n=P max / Q (Formula 1)

[0086] Where: n is the number of side columns 2 and lifting equipment required, unit: piece;

[0087] P max The maximum lifting weight of the inverted installation device, unit: tons (t);

[0088] Q is the rated load-bearing capacity of the lifting equipment, unit: tons (t).

[0089] Among them, P in Formula 1 max The following formula is used to determine:

[0090] P max =K×(P G +P 附 ) (Formula 2)

[0091] P G is the maximum lifting weight of the tower wall panel, unit: tons (t);

[0092] P 附 The weight of the reaction device and other accessories inside the tower, unit: ton (t);

[0093] K is the dynamic load coefficient, which is taken as 1.3.

[0094] For example, in this engineering example:

[0095] P G =3.14×5×19×0.01×7.93=23.66t

[0096] P 附 =20.5t

[0097] P max =1.3×(23.66+20.5)=57.4t

[0098] Considering the balance of the lifting points and the simplicity of operation of the lifting equipment, a manual hoist 5 with Q = 10t is adopted.

[0099] Therefore, n = 57.4 / 10 = 5.74. To ensure the safety of equipment lifting, n is taken as 6.

[0100] According to the calculation results, the side columns 2 and the manual hoist 5 are evenly installed on the base 1. A connecting rod 4 is arranged between two opposite side columns 2. The two ends of the connecting rod 4 are respectively fixedly connected to the corresponding side columns 2. The connecting rod 4 plays a role in strengthening the overall structural strength of the reverse installation device. A limiting plate 3 is welded and installed on the base 1. The limiting plate 3 is located outside the side column 2 and inside the position guiding line of the tower wall panel in step S1. The curvature radius of the limiting plate 3 is equal to the inner diameter of the tower wall panel.

[0101] Step S3, after the single wall panel passes the on-site acceptance, it is hoisted to the installation site; two single wall panels are hoisted onto the base 1 of the reverse installation device, and are tightened with steel wires around the single wall panels. There are two longitudinal gaps between the two single wall panels. First, spot weld the longitudinal gaps, and weld one of the longitudinal gaps from top to bottom. Weld the outside of the longitudinal gap first, and then weld after root cleaning on the inside; after one weld seam is welded, measure the perimeter of the wall panel. After the measurement result meets the requirements, then weld the other longitudinal gap. The two single wall panels are welded to form the top wall panel 10; Hook each manual hoist 5 on the lifting lugs inside the top wall panel 10. When lifting, keep the force of each manual hoist 5 consistent. After the top wall panel 10 is lifted to the predetermined height, lock each manual hoist 5 to maintain the lifting height of the top wall panel 10.

[0102] Step S4, after the top wall panel 10 is lifted to the predetermined height, place two single wall panels below the top wall panel 10. First, weld one of the two longitudinal welds in the second-layer wall panel 20, leaving the other live longitudinal gap unwelded. Then weld the circumferential gap between the second-layer wall panel 20 and the top wall panel 10. When the circumferential gap is welded to 1m on both sides of the live longitudinal gap, weld the live longitudinal gap, and finally complete the closed welding of the circumferential gap. The two single wall panels located below the top wall panel 10 form the second-layer wall panel 20. The longitudinal gap of the second-layer wall panel 20 is symmetrically staggered by 180° from the longitudinal gap of the top wall panel 10 to ensure that the welds on the tower are staggered from each other, avoid the phenomenon of stress concentration, and ensure the strength of the tower.

[0103] Step S5, after the second-layer wall panel 20 and the top wall panel 10 are welded, the top plate can be installed. The top plate is circumferentially welded to the upper end of the top wall panel 10. When welding, ensure the flatness and horizontality of the top plate.

[0104] Step S6: Hang the hook of the chain block 5 on the lifting lug inside the second-layer wall panel 20, lift the welded first two layers of wall panels (i.e., the top-layer wall panel 10 and the second-layer wall panel 20), place two single wall panels under the second-layer wall panel 20, and weld the third-layer to the second-to-last-layer tower wall panels together according to the operation process of Step S4; weld one layer of wall panel, and lift the welded wall panel by the chain block 5 to facilitate the welding of the next layer of wall panel. Before lifting each layer of wall panel, the welding scars on the previous layer of wall panel should be polished and cleaned.

[0105] Step S7: Before welding the bottom-layer wall panel, lift the prefabricated internal reaction device of the tower from the bottom of the tower and install it at the designated position.

[0106] Step S8: After the installation of the internal reaction device in the tower is completed and passes the experiment, weld the bottom-layer wall panel according to the installation method of the wall panel, and weld the bottom-layer wall panel under the second-to-last-layer wall panel. The circumferential inner and outer corner gaps between the bottom-layer wall panel and the bottom plate are evenly and symmetrically distributed by several welders inside and outside the tower, and the segmented backstep welding method is used to weld simultaneously in the same direction.

[0107] Step S9: Perform flaw detection and water filling experiment on the welded tower. After the installation is completed, first perform a 100% radiographic flaw detection experiment on each weld seam, and the quality grade should meet the specification requirements. After the flaw detection experiment is qualified, conduct a water filling experiment on the tower. The water filling experiment uses clean fresh water with a chloride ion content not exceeding 25 ppm. After the water filling reaches the design liquid level, maintain it for 48 hours. If there is no leakage and no abnormal deformation of the tank body, it is considered qualified.

[0108] In summary, in the specific scheme of the large static tower upside-down installation device and the upside-down construction method provided by the present invention:

[0109] After the first-layer tower wall panel is welded on the upside-down installation device, the tower wall panel is lifted by the lifting equipment in the upside-down installation device, so as to facilitate the installation of the next layer of tower wall panel under the lifted tower wall panel. In this way, there is no need to use a large crane to install the large static tower, saving the space for placing the crane on site and realizing the installation of the large static tower in a limited space. Moreover, the welding operation of the tower wall panels in the large static tower is completed on the upside-down installation device, that is, on the ground, which also avoids working at high altitude. This not only ensures the personal safety of the operators, but also has higher working efficiency on the ground compared with working at high altitude. This shortens the installation construction period of the large static tower and improves the installation efficiency of the large static tower.

[0110] Due to the use of the inverted construction method, each heat source plant where a desulfurization tower device (i.e., a large static tower) needs to be installed saves the rental cost of 2 25t cranes, which is 30,000×2×2 = 120,000 yuan. There are 4 construction sites in the Liaoning heating project, namely Shenyang, Benxi, Tieling and Sujiatun, saving a total of 12×4 = 480,000 yuan in crane rental costs.

[0111] It saves about 400,000 yuan in costs such as demolishing and restoring the walls of the desulfurization equipment room in the heat source plant.

[0112] Using this construction method shortens the construction period by 10 days for each construction site, saving a total of 23×10×300×4 = 276,000 yuan in labor costs.

[0113] The total cost savings is about 1,156,000 yuan. This inverted construction method avoids setting up large machinery for hoisting operations in the factory area, saves the consumption of energy such as diesel, and eliminates the noise pollution of mechanical operations. Since the walls of the equipment room do not need to be demolished, the generation of construction waste is reduced, and environmental pollution will not be caused, meeting the requirements of green construction specifications, reducing construction costs, and improving economic benefits.

[0114] Compared with the traditional direct installation method, this construction method not only does not require the use of large machinery, saves the construction period, and saves a large amount of labor and material consumption, but also does not require high-altitude operations, improving the safety guarantee during the construction process.

[0115] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A method for reverse installation construction of large static towers, characterized in that, The reverse construction method includes the following steps: Step S1, construction preparation, on-site measurement and setting out, and draw guiding lines for the positions of the tower wall panels on-site according to the diameter of the tower body; Step S2, determine the number of side columns and lifting equipment, and assemble the reverse installation device; Step S3, weld the single wall panels to form the top layer wall panel, and then lift the top layer wall panel by the lifting equipment; Step S4, place two single wall panels under the top layer wall panel and weld them to form the second layer wall panel, and weld the second layer wall panel to the top layer wall panel; Step S5, install the top plate, and circumferentially weld the top plate to the upper end of the top layer wall panel; Step S6, lift the welded second layer wall panel and the top layer wall panel by the lifting equipment, and according to the operation process of Step S4, weld the tower wall panels from the third layer to the second-to-last layer to the whole formed by the second layer wall panel and the top layer wall panel; Step S7, hoist the prefabricated internal reaction device of the tower body from the bottom of the tower body into the tower body and install it at the designated position; Step S8, weld the bottom layer wall panel under the second-to-last layer wall panel; Step S9, perform flaw detection and water filling test on the welded tower body. In Step S2, weld and install the determined number of side columns on the base, install lifting equipment on each side column, fixedly set connecting rods between the side columns, and the two ends of the connecting rod are respectively fixedly connected to the corresponding side columns. Install a limiting plate on the base, and the radius of curvature of the limiting plate is equal to the inner diameter of the tower body. The specific content of Step S3 is: hoist two single wall panels onto the base of the reverse installation device, tighten them with steel wire ropes around the periphery of the single wall panels. There are two longitudinal gaps between the two single wall panels. First, spot weld the longitudinal gaps, weld one of the longitudinal gaps from top to bottom. Weld the outside of the longitudinal gap first, and then weld the inside after root cleaning; after one weld seam is welded, measure the circumference of the wall panel. After the measurement result meets the requirements, then weld the other longitudinal gap, and the two single wall panels are welded to form the top layer wall panel; hook the lifting equipment on the lifting lugs inside the top layer wall panel. When the top layer wall panel is lifted to the predetermined height by the lifting equipment, lock the lifting equipment to maintain the lifting height of the top layer wall panel. The specific content of Step S4 is: after the top layer wall panel is lifted to the predetermined height, place two single wall panels under the top layer wall panel. First, weld one of the two longitudinal weld seams between the two single wall panels, leaving the other longitudinal gap as a live gap without welding. Then weld the circumferential gap between the two single wall panels and the top layer wall panel. When the circumferential gap is welded to both sides of the live longitudinal gap, weld the live longitudinal gap, and finally complete the closed welding of the circumferential gap. The two single wall panels located under the top layer wall panel form the second layer wall panel, and the welding of the second layer wall panel and the top layer wall panel is completed.

2. The large static tower inverted construction method according to claim 1, characterized in that, The specific content of Step S6 is: hook the lifting hook of the lifting equipment on the lifting lugs inside the second layer wall panel, lift the welded top layer wall panel and the second layer wall panel, place two single wall panels under the second layer wall panel, and weld the tower wall panels from the third layer to the second-to-last layer together according to the operation process of Step S4; Weld one layer of wall panel, and lift the welded wall panel by the lifting equipment to weld the next layer of wall panel under the lifted wall panel.

3. The large static tower inverted construction method according to claim 1, characterized in that, The specific steps of step S8 are as follows: After the internal reaction device of the tower body is installed and passes the experiment, the bottom wall plate is welded according to the installation method of the wall plates. The bottom wall plate is welded below the penultimate layer of wall plates. The circumferential inner and outer corner gaps between the bottom wall plate and the bottom plate are welded by the segmented backstep welding method, and the welding of each section of the gap is carried out simultaneously in the same direction.

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