A method for installing a three-pipe bundled self-supporting steel chimney

Abstract

The present application relates to a kind of three-tube cluster self-standing steel chimney installation method.The installation method includes the following steps:S1: first, the upper chimney cylinder is hoisted and welded by crane;S2: install upper platform ladder and accessory components on the upper chimney cylinder;S3: install lifting mechanism at the bottom of the upper chimney cylinder;S4: lift the upper chimney cylinder by using the lifting mechanism;The present application uses hydraulic lifting and inversion method to install large chimney by combining the installation method of positive assembly and inversion assembly, which reduces the installation height, and the installation of super-high chimney can be completed by using 150 tons or less crane for hoisting and organizing construction, with the advantages of no need for large hoisting equipment, less high-altitude operation, simple welding protection measures, easy installation operation, low construction cost and reliable safety and quality guarantee measures.

Description

Technical Field

[0001] This invention belongs to the field of chimney installation technology, specifically relating to a method for installing a three-tube bundled self-supporting steel chimney. Background Technology

[0002] A chimney is a structure that provides ventilation for hot flue gas or smoke. The height of a chimney affects its ability to deliver flue gas to the external environment through the chimney effect.

[0003] The chemical, metallurgical, and power industries all emit emissions through chimneys. In order to meet emission standards, the chimneys are designed to be tall according to project requirements, which leads to a large amount of high-altitude work, high safety risks, and high operating costs of large cranes, thus increasing installation costs. Summary of the Invention

[0004] The purpose of this invention is to provide a method for installing a three-tube bundled self-supporting steel chimney in order to solve the problems mentioned in the background art.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A method for installing a three-tube bundled self-supporting steel chimney includes the following steps:

[0007] S1: First, use a crane to lift and weld the upper section of the chimney body;

[0008] S2: Install the upper platform ladder and auxiliary components on the upper section of the chimney;

[0009] S3: Install a lifting mechanism at the bottom of the upper section of the chimney;

[0010] S4: Use the lifting mechanism to lift the upper section of the chimney;

[0011] S5: After the upper section of the chimney is lifted into place, assemble the middle section of the chimney, measure and correct the spatial position of the middle section of the chimney, and then weld it.

[0012] S6: Remove the lifting mechanism from the upper section of the chimney and install it on the middle section of the chimney;

[0013] S7: Assemble the lower section of the chimney using the same method as installing the middle section of the chimney.

[0014] Preferably, the lifting mechanism in S3 includes a lifting frame, a lifting rod, and a climbing assembly, wherein the lifting frame is used to fix the lifting rod;

[0015] The climbing assembly consists of a climbing machine, a hydraulic pump station, and a PLC control system. The climbing machine moves on the lifting rod under the control of the hydraulic pump station and the PLC control system to achieve the lifting action.

[0016] Preferably, the climbing machine includes an upper plate and a lower plate that are parallel to each other, and two double-acting hydraulic cylinders are provided between the upper plate and the lower plate. The double-acting hydraulic cylinders are used to change the distance between the upper plate and the lower plate. Both the upper plate and the lower plate are provided with clamps for clamping lifting rods, and the lifting rods are provided with slots corresponding to the clamps.

[0017] Preferably, the lifting rod includes a positioning rod, a transition rod, and a connecting rod.

[0018] Preferably, the lower plate is provided with two stop mechanisms, which are used to stop the climber from falling when the gripper malfunctions;

[0019] The stopping mechanism includes a rotating shaft mounted on the lower plate, with rollers concentrically arranged on the rotating shaft. The rollers are in contact with the surface of the lifting rod. The rotating shaft is equipped with a flywheel and a rotating plate that rotate concentrically. The rotating plate is connected to the rotating shaft through the flywheel. The rotating plate is equipped with a stop plate that is in contact with the surface of the lifting rod. A return spring is provided between the rotating plate and the lower plate.

[0020] The beneficial effects of this invention are as follows:

[0021] This invention employs a combination of upright and inverted installation methods, using a hydraulic lifting inverted method to install large chimneys. This reduces the installation height, allowing the installation of ultra-tall chimneys to be completed using cranes with a lifting capacity of less than 150 tons. It has the advantages of requiring no large hoisting equipment, minimizing high-altitude work, simplifying welding protection measures, facilitating easy installation, reducing construction costs, and ensuring reliable safety and quality. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the chimney in this invention;

[0023] Figure 2 This is a schematic diagram of the arrangement of the lifting mechanism installed on the upper section of the chimney body in this invention;

[0024] Figure 3 This is a schematic diagram of the arrangement of the lifting mechanism installed in the middle section of the chimney body in this invention;

[0025] Figure 4 This is a schematic diagram of the arrangement of the lifting mechanism for the lower section of the chimney in this invention;

[0026] Figure 5 This is a schematic diagram of the lifting mechanism in this invention;

[0027] Figure 6 This is a schematic diagram showing the positional relationship between the lifting frame and the lifting rod in this invention;

[0028] Figure 7 This is a schematic diagram of the climbing machine in this invention;

[0029] Figure 8 yes Figure 7 Enlarged view of point A in the middle;

[0030] Figure 9 This is a structural diagram of the lifting rod.

[0031] In the diagram: a) Lifting mechanism; 1) Lifting frame; 2) Lifting rod; 3) Upper plate; 4) Lower plate; 5) Double-acting hydraulic cylinder; 6) Clamp; 7) Slot; 8) Positioning rod; 9) Transition rod; 10) Connecting rod; 11) Rotating shaft; 12) Roller; 13) Flywheel; 14) Rotating plate; 15) Stop plate; 16) Return spring. Detailed Implementation

[0032] The present application will now be described in further detail. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0033] Example 1

[0034] like Figure 1-9 As shown, a method for installing a three-tube bundled self-supporting steel chimney includes the following steps:

[0035] S1: First, use a crane to lift and weld the upper section of the chimney body;

[0036] S2: Install the upper platform ladder and auxiliary components on the upper section of the chimney;

[0037] S3: Install lifting mechanism a at the bottom of the upper section of the chimney;

[0038] S4: Use lifting mechanism a to lift the upper section of the chimney;

[0039] S5: After the upper section of the chimney is lifted into place, assemble the middle section of the chimney, measure and correct the spatial position of the middle section of the chimney, and then weld it.

[0040] S6: Remove the lifting mechanism a from the upper section of the chimney and install it on the middle section of the chimney.

[0041] S7: Assemble the lower section of the chimney using the same method as installing the middle section of the chimney.

[0042] As a further embodiment of the present invention, the lifting mechanism a in S3 includes a lifting frame 1, a lifting rod 2 and a climbing assembly, wherein the lifting frame 1 is used to fix the lifting rod 2;

[0043] The climbing assembly consists of a climbing machine, a hydraulic pump station, and a PLC control system. The climbing machine moves on the lifting rod 2 under the control of the hydraulic pump station and the PLC control system to achieve the lifting action.

[0044] As a further embodiment of the present invention, the climbing machine includes an upper plate 3 and a lower plate 4 that are parallel to each other. Two double-acting hydraulic cylinders 5 are provided between the upper plate 3 and the lower plate 4. The double-acting hydraulic cylinders 5 are used to change the distance between the upper plate 3 and the lower plate 4. Both the upper plate 3 and the lower plate 4 are provided with clamps 6 for clamping the lifting rod 2. The lifting rod 2 is provided with a slot 7 corresponding to the clamps 6.

[0045] As a further embodiment of the present invention, the lifting rod 2 includes a positioning rod 8, a transition rod 9, and a connecting rod 10.

[0046] In the above embodiment, the chimney is designed as a three-tube self-supporting steel chimney, employing a structure with three steel cylinders arranged in a tripod configuration at the base and the three cylinders closely adjacent to each other at the top. It includes a multi-layered steel beam platform from bottom to top, and features a flue, spiral staircase, and an elevator shaft located between the three cylinders. The chimney has a total height of 180 meters. The upper 50-meter section (above 130 meters) is manufactured in 10-meter segments, totaling 5 segments. The remaining sections are manufactured in 2.5-meter segments. If time constraints require, segments of 5, 7.5, or 10 meters can also be manufactured. The middle section of the chimney has 4 segments, each 25 meters long, and the lower section is 30 meters long. Upon arrival on site, the segmented sections are assembled into a single unit.

[0047] First, assemble the chimney pipe sections into large segments on the ground, starting from the top and in 20-30 meter lengths, according to the layout. Lay a 14m x 14m steel platform on the foundation. Mark the axis and position of the fourth segment from the top, as well as the projection line of the assembly joint, on the steel platform. Set up eight temporary bolting points on the steel platform. At the installation site, assemble the first and second segments of the upper chimney body into 20-meter and 30-meter segments respectively. Use a 150-ton crane to lift the 20-meter and 30-meter segments. First, lift the first 30-meter segment, temporarily securing the lower end on the platform with bolts. Use a total station to measure the upper end and adjust and secure it with guy ropes. Lift the second segment in the same way, connecting the two segments with a steel beam. Then lift the third segment, installing the connecting beam and operating platform. Lift the 20-meter segment in the same way, adjusting the positions of all three segments.

[0048] The lower 130 meters of the steel chimney pipe section will be lifted in 2.5-meter sections using an inverted installation method. A set of lifting lugs will be installed every four sections, for a total of 13 sets of lugs. Three sets of hydraulic lifting mechanisms (a) will be arranged along the vertical projection direction of the three chimney pipes, deployed in four stages: 70-130 meters, 40-70 meters, 20-40 meters, and 0-20 meters.

[0049] Among them, the lifting frame 1 column is a steel pipe lattice frame, and the lifting main beam is made of welded H-beams;

[0050] The climbing assembly consists of a climbing machine, a hydraulic pump station, a lifting rod 2, and a PLC control system. A single 150-ton hydraulic climbing assembly employs a double-acting hydraulic cylinder 5 and two sets of upper and lower pawls working alternately. Specifically, the climbing machine comprises the double-acting hydraulic cylinder 5 and upper and lower grippers 6. The lifting action is achieved by the continuous alternating action of the gripping teeth of the upper and lower grippers 6 on the grooves 7 of the lifting rod 2. Specifically, the lower gripper 6 clamps onto the grooves 7 of the lifting rod 2, and the double-acting hydraulic cylinder 5 moves the upper plate 3 upward. After the upper plate 3 stops moving, the upper gripper 6 clamps onto the grooves 7 of the lifting rod 2, and the double-acting hydraulic cylinder 5 moves the lower plate 4 upward, achieving the overall lifting.

[0051] Each climbing machine is controlled by a hydraulic pump station. The working status of the climbing machine is monitored by displacement sensors and pressure sensors. The PLC control system adopts the dual control principle of pressure and displacement, and monitors and controls the working status of the climbing machine by using the feedback from displacement and pressure sensors.

[0052] During synchronous jacking, displacement and pressure are monitored simultaneously. The hydraulic pump station supplies oil to the double-acting hydraulic cylinders 5 of all climbing machines. The pistons of the double-acting hydraulic cylinders 5 extend, and displacement sensors monitor the extension amount of the pistons of each climbing machine. When the height difference of a certain piston exceeds the required error value, the control system controls the action of the solenoid directional valve of the hydraulic pump station to temporarily stop the piston's action. After the pistons of the double-acting hydraulic cylinders 5 of other climbing machines extend and catch up, the solenoid directional valve is opened again, allowing the stopped piston to move upward again. By controlling the action of the solenoid directional valve of the hydraulic pump station, the extension and retraction of the pistons of the double-acting hydraulic cylinders 5 of the climbing machines are controlled, so that the clamping teeth of the upper and lower clamps 6 work alternately on the slots 7 of the lifting rod 2, thereby lifting the steel structure lifting section into place.

[0053] The lifting rod 2 consists of a positioning rod 8, a transition rod 9, and a connecting rod 10, all made of high-strength alloy material. The positioning rod 8 has a slot 7 for bearing support during the lifting process by the climbing machine. The connecting rod 10 is used for fixed connection with the upper support frame. The transition rod 9 can deflect to a certain extent during the lifting process to accommodate various deformations during installation and lifting.

[0054] Chimney Lifting: After the lifting and stabilization systems have passed inspection, the lifting system is activated to lift the chimney. While lifting, the verticality of the chimney is monitored using a total station along the centripetal direction of each section. When the verticality deviation exceeds the allowable value (generally 100mm), the lifting is stopped, and the verticality of the chimney is adjusted. If the verticality meets the requirements, the lifting continues until the lifting height is reached. Then, the chimney sections are assembled, welded, and inspected. After the installation work is completed, the next cycle of construction begins until all sections are assembled.

[0055] As a further embodiment of the present invention, the lower plate 4 is provided with two stop mechanisms, which are used to stop the climber from falling when the clamp 6 malfunctions.

[0056] The stopping mechanism includes a rotating shaft 11 mounted on the lower plate 4. Rollers 12 are concentrically mounted on the rotating shaft 11 and contact the surface of the lifting rod 2. A flywheel 13 and a rotating plate 14 are concentrically mounted on the rotating shaft 11. The rotating plate 14 is connected to the rotating shaft 11 through the flywheel 13. A stop plate 15 is mounted on the rotating plate 14 and contacts the surface of the lifting rod 2. A return spring 16 is provided between the rotating plate 14 and the lower plate 4.

[0057] In the above embodiment, when the gripper 6 malfunctions, the climbing machine will fall. At this time, the roller 12 rolls on the surface of the lifting rod 2, and the flywheel 13 (rotates in one direction) drives the rotating plate 14 to rotate, so that the stop plate 15 is in close contact with the surface of the lifting rod 2, thereby preventing the lower plate 4 from moving downward and ensuring that the climbing machine is in a relatively stable state. When the climbing machine moves upward, the roller 12 does not drive the rotating plate 14 to rotate, and the return spring 16 pulls the stop plate 15 to maintain a distance from the lifting rod 2, which does not affect the normal movement of the climbing machine.

[0058] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method for installing a three-tube bundled self-supporting steel chimney, characterized in that, Includes the following steps: S1: First, use a crane to lift and weld the upper section of the chimney body; S2: Install the upper platform ladder and auxiliary components on the upper section of the chimney; S3: Install a lifting mechanism (a) at the bottom of the upper section of the chimney. S4: Use the lifting mechanism (a) to lift the upper section of the chimney; S5: After the upper section of the chimney is lifted into place, assemble the middle section of the chimney, measure and correct the spatial position of the middle section of the chimney, and then weld it. S6: Remove the lifting mechanism (a) on the upper section of the chimney and install it on the middle section of the chimney; S7: Assemble the lower section of the chimney using the same method as installing the middle section of the chimney. The lifting mechanism (a) described in S3 includes a lifting frame (1), a lifting rod (2), and a climbing assembly. The lifting frame (1) is used to fix the lifting rod (2). The climbing assembly consists of a climbing machine, a hydraulic pump station and a PLC control system. The climbing machine moves on the lifting rod (2) under the control of the hydraulic pump station and the PLC control system to achieve the lifting action. The climbing machine includes an upper plate (3) and a lower plate (4) that are parallel to each other. Two double-acting hydraulic cylinders (5) are provided between the upper plate (3) and the lower plate (4). The double-acting hydraulic cylinders (5) are used to change the distance between the upper plate (3) and the lower plate (4). Both the upper plate (3) and the lower plate (4) are provided with clamps (6) for clamping the lifting rod (2). The lifting rod (2) is provided with a slot (7) corresponding to the clamp (6). The lower plate (4) is provided with two stop mechanisms, which are used to stop the climber from falling when the clamp (6) malfunctions; The stopping mechanism includes a rotating shaft (11) on the lower plate (4), with rollers (12) concentrically arranged on the rotating shaft (11). The rollers (12) are in contact with the surface of the lifting rod (2). The rotating shaft (11) is provided with a flywheel (13) and a rotating plate (14) that rotate concentrically. The rotating plate (14) is connected to the rotating shaft (11) through the flywheel (13). The rotating plate (14) is provided with a stop plate (15), which is in contact with the surface of the lifting rod (2). A return spring (16) is provided between the rotating plate (14) and the lower plate (4).

2. The method for installing a three-tube bundled self-supporting steel chimney according to claim 1, characterized in that, The lifting rod (2) includes a positioning rod (8), a transition rod (9), and a connecting rod (10).

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