CN-122014049-A - Lifting, installing and constructing method for inverted-Y-shaped steel sleeve chimney

Abstract

The invention discloses a lifting installation construction method for a triangular steel sleeve chimney, and belongs to the technical field of chimney construction. According to the method, a hydraulic lifting base is arranged on a permanent steel platform at the top of a reinforced concrete outer cylinder by adopting a ground sectional assembly welding, integral modularized lifting and cylinder opening flip-chip welding method, so that construction preparation and lifting system installation, cylinder section prefabrication and transportation, top section hoisting fixation, cyclic lifting welding, auxiliary working procedure synchronous penetration and final positioning and accessory installation are sequentially completed, and collaborative lifting installation of three inverted V-shaped steel inner cylinders is realized. According to the method, the lifting deviation is accurately controlled through the hydraulic synchronous lifting system, the anti-corrosion heat preservation construction is synchronously carried out in combination with the line operation mode, the construction flow is optimized, the installation accuracy and the construction efficiency are improved, the risk of high-altitude operation is reduced, the method is suitable for the installation construction of a large-height and large-tonnage delta-shaped steel sleeve chimney, and the practicability is high.

Inventors

• ZHANG YU
• YU DONGXUE
• WANG GUOFA

Assignees

• 中化二建集团有限公司

Dates

Publication Date

20260512

Application Date

20260331

Claims (8)

1. 1. A lifting installation construction method for a triangular steel sleeve chimney is characterized in that a reverse construction method of ground sectional assembly welding, integral modularized lifting and barrel opening reverse welding is adopted, a hydraulic lifting base is arranged on a permanent steel platform at the top of a reinforced concrete outer barrel, and the following steps are sequentially executed: The construction method comprises the steps of S1, installing a construction preparation and lifting system, carrying and grading inspection on a permanent steel platform, welding and reinforcing the steel in a grid shape, designing a load 1.1 times of the load after reinforcement, constructing an assembly platform on zero-meter-layer steel of a chimney, paving a track on the platform, arranging traction equipment and an adjustable positioning clamp, reserving an overhaul and emergency channel, installing a hydraulic synchronous lifting system corresponding to the axis of each steel inner cylinder, arranging a plurality of through jacks on each steel inner cylinder, arranging a plurality of high-strength low-relaxation steel strands on each jack, arranging independent pump stations for each jack by a pump station cluster of the hydraulic synchronous lifting system, arranging a master control pump station for the pump stations of the hydraulic synchronous lifting system, connecting a plurality of groups of sensors by a computer synchronous control system, and synchronously constructing a top-middle-bottom all-dimensional safety protection system for each inner cylinder by arranging a plurality of groups of verticality monitoring points on the permanent steel platform, the middle part of the concrete outer cylinder and the bottom assembly platform; S2, prefabricating a cylindrical shell section and horizontally transporting the cylindrical shell section on the ground, prefabricating a height-adjustable titanium steel composite board standard section, arranging a positioning structure and a butt joint groove at two ends of the standard section, and performing ultrasonic and ray combined nondestructive testing after welding; S3, the first section of hoisting is fixed with the top section, a fixed-height standard section is selected as the top section, and after size rechecking, surface cleaning and butt joint groove polishing, lifting lugs made of the same material as the cylinder are welded at the top; the method comprises the steps of lifting a top section to a designed elevation at a constant speed through a lifting system, stopping the lifting process in a stepwise manner, and rechecking verticality, wherein the axis of the top section coincides with the designed axis; S4, circularly lifting and welding operation, namely connecting the lower end of a steel strand of a hydraulic lifting system with the upper end of a top joint in a double-safety manner, dismantling an adjustable positioning device, reserving a temporary rigid support, realizing three-cylinder collaborative lifting at a constant speed through a computer synchronous control system, controlling the lifting height to be the single standard joint module height, controlling the synchronous deviation within the precision requirement range, conveying a new standard joint to the lower part of a lifting space, precisely assembling by a hydraulic drive assembling device, fixing by adopting a temporary positioning structure after assembling, welding by adopting a gas shielded welding device in a single-sided welding and symmetrical welding mode without adding a backing plate, converting a lifting system connecting point to the upper end of the new joint after welding line detection is qualified, dismantling the temporary positioning structure, and repeating the operation steps of collaborative lifting to detection; s5, synchronously inserting auxiliary processes, adopting a line production mode for three inner cylinders, adopting a bottom assembly platform to take charge of standard joint assembly welding, and adopting a middle platform of a concrete outer cylinder to carry out corrosion prevention and heat preservation construction on the lifted and detected qualified cylinder section; S6, finally installing the bracket and the accessories, fully checking to ensure the full height verticality and axis deviation of the cylinder after the total height of the cylinder meets the design requirement, lifting the steel inner cylinder to a designated position above the design elevation, lowering the steel inner cylinder to the design elevation at a low speed, locking the lifting system after the steel inner cylinder falls down, welding steel corbels at the bottom of the cylinder, fully welding the corbels with the cylinder and the rigid supports at the bottom, symmetrically welding reinforcing rings, performing nondestructive testing and stress detection after the corbels are welded with the reinforcing rings, removing the lifting system according to the sequence of steel stranded wires, jacks, pump station clusters, and lifting the spandrel girder, and completing the whole engineering by adopting a grading unloading mode when removing the steel stranded wires.
2. 2. The method of claim 1, wherein the lifting spandrel girder of the hydraulic synchronous lifting system in S1 is fully welded with the platform reinforcing structure, and the computer synchronous control system automatically stops and adjusts when deviation exceeds standard and load is abnormal.
3. 3. The method according to claim 1 or 2, wherein the comprehensive inspection of the prefabricated standard joint in the step S2 comprises comprehensive detection of dimensional accuracy, roundness, weld quality and material property, and an anti-slip backing plate is paved on the surface of a concrete outer cylinder bottom section steel transition platform.
4. 4. A method according to claim 3, wherein the top section in S3 is connected to the steel strand of the lifting system by a special anchor, the temporarily rigidly supported anchor is firmly connected to the concrete outer cylinder, and the double fixing structure is free from looseness and deformation.
5. 5. The method according to claim 1 or 3, wherein before the three cylinders are lifted cooperatively in the step S4, the synchronization of a lifting system is confirmed to be good, the stress of the steel strands is uniform, and the alignment precision of the hydraulically driven alignment device is monitored in real time through a laser ranging device.
6. 6. The method of claim 5, wherein the welding operation in S4 employs a liftable suspension construction platform, and a special person is arranged to monitor the welding temperature and the weld formation and adjust the welding process parameters in time.
7. 7. The method according to claim 1 or 6, wherein the quality of the anti-corrosion heat-preservation construction in S5 is checked, and the special detection of the thickness and the adhesive force of the anti-corrosion layer, the thickness of the heat-preservation layer and the fixing firmness is included.
8. 8. The method of claim 7, wherein the steel inner cylinder in S6 is in a double fixing mode of bracket welding and reinforcing ring reinforcement after being in place, and the welding process adopts technological measures to reduce the influence of welding stress on the cylinder structure.

Description

Lifting, installing and constructing method for inverted-Y-shaped steel sleeve chimney Technical Field The invention belongs to the technical field of chimney construction, and particularly relates to a lifting installation construction method for a triangular steel sleeve chimney, which is suitable for flip-chip lifting installation of a three-tube sleeve chimney steel inner tube of an ultra-high large-tonnage titanium steel composite plate, and is particularly suitable for industrial chimney construction scenes with limited working space and high requirements on installation precision and construction safety in a reinforced concrete outer tube. Background With the continuous upgrading of industrial environmental protection requirements in the industries of electric power, chemical industry and the like, the flue gas emission treatment standard is continuously improved, and the application of the three-tube sleeve chimney steel inner tube of the titanium steel composite plate with large height and large tonnage is wider. The height of a single steel inner cylinder can reach more than 150m, the weight of the single steel inner cylinder can reach 200T, three inner cylinders are arranged in the reinforced concrete outer cylinder in a delta shape, the requirements on the installation precision and the structural stability are severe, and the construction requirements are difficult to meet by the traditional construction method and the existing flip-chip lifting technology. In the prior art, although a part of overhead operations are reduced by adopting a flip-chip method, the method still has a plurality of defects that firstly, lifting points are not optimized according to the spatial characteristics of the arrangement of the triangular three cylinders, the cylinders are easy to collide with each other in the lifting process, large lifting equipment cannot operate in a narrow concrete outer cylinder, the construction flexibility is poor, secondly, the synchronous control precision of a lifting system is insufficient, a single synchronous control unit is adopted, an independent cylinder monitoring and adjusting module is not arranged, the synchronous error is large, the synchronous lifting requirement of the triangular three cylinders cannot be met, thirdly, the welding workload is large, the construction period is long, the four steps are lack of scientific basis for the arrangement of the steel strands and the bearing calculation of a lifting platform, the steel strands are asynchronous, the lifting platform is easy to deform and collapse, the three cylinders are required to be concentratedly constructed after the whole installation of the three cylinders are finished, the mutual interference is easy to realize, the six-dimensional operations are difficult to accept, the welding seam quality is difficult to be influenced by the welding quality control of the welding seam, and the safety factor of the welding structure is difficult to be influenced. Therefore, development of a method for lifting, installing and constructing a triangular steel sleeve chimney, which is adaptive to the characteristic of the triangular arrangement, high in lifting synchronism, controllable in construction precision, in-place in safety protection and efficient in process cooperation, is needed, and the defects of the prior art are overcome. Disclosure of Invention The invention overcomes the defects of the prior art, and provides a lifting installation construction method for the triangular steel sleeve chimney, which realizes the efficient and accurate installation of the triangular three cylinders by optimizing the configuration, synchronous control and monitoring modes of a lifting system and meets the construction requirements of a large-height and large-tonnage titanium steel composite plate chimney. In order to solve the technical problems, the technical scheme adopted by the invention is that the lifting installation construction method for the inverted T-shaped steel sleeve chimney is characterized in that a face-down construction method of ground sectional assembly welding, integral modularized lifting and barrel opening face-down welding is adopted, a hydraulic lifting base is arranged on a permanent steel platform at the top of a reinforced concrete outer barrel, and the following steps are sequentially executed: The construction method comprises the steps of S1, installing a construction preparation and lifting system, carrying and grading inspection on a permanent steel platform, welding and reinforcing the steel in a grid shape, designing a load 1.1 times of the load after reinforcement, constructing an assembly platform on zero-meter-layer steel of a chimney, paving a track on the platform, arranging traction equipment and an adjustable positioning clamp, reserving an overhaul and emergency channel, installing a hydraulic synchronous lifting system corresponding to the axis of each steel inner cylinder, arranging a