One: project overview
The ring cooler demolition of the sintering machine of the first ironmaking plant of Maanshan Iron Works is undertaken by the second branch of the construction engineering company, and the demolition project focuses on the demolition of the fan, sealing cover, carts and rails, friction plates, and the steel frame, etc. Protective demolition is chosen, and the number of each equipment must be given before demolition. Protective dismantling was chosen, and the numbering of the equipment had to be done before dismantling in order to facilitate the installation. This project is characterized by a short construction period and a large amount of work, in addition to the construction site and the existence of cross operations. So the company for this demolition project is very important.
Two: the preparation of the basis
According to the drawings provided by the unit and the demolition requirements for the preparation of this construction program, in addition to the actual weight of the object and combined with the performance of the main lifting tool table to choose the crane and other auxiliary tools.
Three: process
The demolition is a protective demolition, the demolition must be well marked. Adopting the way of dismantling from top to bottom, the structure and characteristics of this ring cooler consider the first dismantling is the fan, and then the removal of the sealing cover, from the cart body above the dismantling is completed after the removal of the cart, rail, friction plate removal. Next is the dismantling of the transmission part, because it is necessary to rotate the cart to cooperate in the dismantling project, so the dismantling of the transmission part is put in the back. This is followed by the dismantling of the bulk material system and the unloading system, and finally by the dismantling of the steel frame. In the demolition of the project can have cross demolition and demolition of points, in the following construction network plan has a specific embodiment.
Four: the preparation of machinery and equipment
Hand hoist 1 ton, 2 tons of a number of 5-ton winch 2, crane 50 tons of 7 benches, 25 tons of 10 benches, 12 tons of 10 benches, 20 benches of the big car.
Five: personnel organization
By the nature of the demolition to determine the demolition process can not be damaged, requiring the construction process must be fine. Then according to the site of the construction environment and the requirements of the construction period to arrange the construction personnel, but also because it is a demolition project, so the welder and the heavy lifting requirements are very large, 12 welders, heavy lifting 10 people, 4 clamps, riveters 4 people.
Six: specific construction methods
The demolition project selection from top to bottom protective demolition, due to the Party should be required to remove the process should be properly stored a variety of devices. After dismantling, it should be repaired and overhauled in a timely manner, and placed in a designated location for uniform placement, and then transported to the site of the combined steel. Specific construction methods can be set up as follows, in accordance with the construction requirements in order to facilitate the installation of the removal of marking, and then dismantled one by one.
6.1 fan
The number of fan equipment for three, can be developed from the inlet to the outlet of a large direction that is, respectively
Figure 1: fan marking and lifting diagram
Select the fan 1, fan 2, fan 3, as shown in Figure 1. Three fans can choose to dismantle the way at the same time, from the sealing of the fume hood began to dismantle, the middle by the impeller, reducer, motor, choose 50 tons of crane, crane footholds and lifting schematic diagram shown in Figure 1, hand hoist with the demolition of the demolition of the demolition of the electric control system and the removal of the oil circuit before the demolition of the electric control system and the demolition of the oil circuit.
6.2 sealing cover
With the same fan, from the inlet to the outlet to mark the order of the sealing cover, an inlet end of the sealing cover and an outlet end of the sealing cover, the middle of the **** 5 sealing cover, 11 sealing cover, 2 expansion sealing cover, 2 expansion sealing cover. On the other three fans there is one sealing hood on the left and one on the right, and two sealing hoods in the center of the fan. ***There are 44 sealing covers, which can be numbered with paint from 1 to 44 (also excluding the sealing covers around the fans and numbering the others in individual forms). As seen from the site drawings, the heaviest sealing cover for 1320kg, so according to the main lifting machine performance table can choose 25 tons crane, construction site complex lifting points farther away from the choice of 50 tons crane with. The removal of the sealing cover in order to facilitate the transportation, on-site disintegration into three pieces, timely division of inverted transport, internal small systems to mark, to avoid the complexity of the scene. This dismantling process must pay attention to the process of cutting screws must be protected with a crane or hand hoist to prevent accidents.
6.3 cart
This number is the same as the above method, *** counting 45 amount of cart. Demolition process, please cooperate with the rotation, the weight of the cart is 1437kg, you can choose 25 tons of crane with lifting, lifting schematic diagram in Figure 2 put the process of the cart with a forklift with the timely inverted to the designated location for the restoration of the cart. In addition, note that in the process of dismantling the cart on one side of the cart to take off the other side and not dismantled, may be able to appear as a whole side of the bias, so that the friction wheel and the friction plate engagement is too deep, so we require Party A to cooperate with the rotation of the cart, every few to take a method, so that the dismantling process of the cart can be a smooth rotation, the cart put the process of the process of the cart with the forklift to the designated location in a timely manner with the inverted to the restoration of carts.
Figure 2: Marking of transmission device and schematic diagram of cart lifting
6.4 Rail and friction plate
Since the ring cooler is dismantled and installed, due to the wear and tear of the rail and friction plate during the running process, the machine must be installed according to the original assembly and the order must not be reversed, or else the cart may cause the edge of the cart, as well as the bracket wheels do not rotate and the retaining wheels are too big to be engaged and so on, so as in the above method, the trolley is installed from the entrance to the trolley. Therefore, it is the same as the above method from the beginning of the inlet number until the end of the outlet. Track *** there are three around the ring cooler week, can be dismantled at the same time, the choice of 12 tons of cranes and hand hoists and other tools for dismantling, the space is narrow part of the winch with the inverted out of this part of the number is very small, do not explain in detail, the site construction process according to the actual situation to determine.
The friction plate is one of the important equipments of this ring cooler, it must be operated finely in the process of dismantling, there should be no distortion and deformation, and attention should be paid to the protection in the second inverted transportation, this friction plate is linked with stranded bolts, when dismantling it, you can cut off the bolts first (pay attention to the stranded bolts prepared for the installation), and the ring cooler is installed for one week ****15
Three Figures: distribution of the friction plate and the lifting diagram of the friction plate, the friction plate, the single piece weight of 560kg. The weight of a single piece of 560kg, can choose 12 tons of crane to hoisting, crane position station selection is reasonable as shown in figure three.
6.5 Transmission parts
The ring cooler transmission device is composed of two drive systems, symmetrically distributed on both sides of the entire ring cooling system, each drive has two friction wheels up and down, drive the friction plate connected to the trolley, so as to achieve the speed requirements. The same as above can be from the inlet to the outlet set a fixed direction, thus marking out the transmission device 1 and 2, as shown in Figure II. Remove the process of attention to the reducer and friction wheel protection, you can choose to use 25 tons of crane with the demolition, demolition of the reducer after the opening of the overhaul.
6.6 platform and steel framework
From the above equipment removal is completed, the remaining is the bracket and some other foundation planes of the foundation and platform removal, including cart bracket, fan bracket, the transmission part of the bracket and some ladder, protective railing, fan bracket and transmission part of the bracket marking can be respectively in accordance with the marking of the fan and the transmission device to determine the marking of both fan bracket 1, 2, 3, and the transmission device to determine the marking of the fan bracket 1, 2, 3, and the transmission device to determine the marking. Both fan bracket 1, 2, 3, transmission part bracket 1, 2, the dolly bracket is also determined in accordance with the direction from the inlet to the outlet. This part of the demolition should start from the fan bracket and transmission part of the bracket removal, in order to facilitate the transportation should be in the form of face demolition, that is, for a four-legged columns of the steel structure can choose two connected to the middle of the auxiliary frame do not have to remove. Fan bracket, drive part of the bracket removal is completed after the removal of the cart bracket, you can multi-point demolition at the same time to start. Removal process should be done in the internal small system of marking, choose 12 tons crane.
The above is the marking and removal of all devices, in addition to a single device such as feed hopper and bulk system can not do the marking, here is just to determine the direction of the big, such as the transmission part and the fan part of the internal small structure of the site removal is divided into pieces for demolition, so it must be internal small system marking must be done to prevent confusion, to the installation of the unnecessary trouble. The process of dismantling the structure of each piece of equipment starts from the The removal process of the structure of each device, from the large aspects of the elaboration, specifically according to the construction of the site to determine the division of small details.
Seven: quality management points and safety control measures
1. Establishment of a sound safety system, enter the site before the construction personnel for safety education, strengthen the awareness of safety and quality, seriously do all the preparatory work, a comprehensive understanding of the demolition of the project drawings and information, the construction site Kancan, the demolition of the construction personnel for the safety of the technical briefings. Prepare construction organization design or safety special construction plan and formulate emergency rescue plan for safety accidents. Ensure that the quality of the project is completed on time and according to quality.
2. Demolition project construction area should be set up hard closed enclosure and conspicuous warning signs, non-construction personnel are not allowed to enter the construction area, demolition of the items under the timely organization and repair, placed in designated locations, centralized storage.
4. Electrical welding equipment set up obvious signs, and fire, explosion-proof measures.
5. lifting, lifting and pulling equipment and machinery managed by a person to confirm the safety before use. Large pieces of demolition lifting the use of wire rope length, diameter should be a reasonable choice, lifting point in the use of pre-requirement confirmation, lifting process should be commanded by a person with a clear signal.
6. Construction personnel clear operation of the various safety matters, strict compliance with safety and technical regulations and operating regulations, when the demolition works on the surrounding adjacent buildings may be dangerous to the safety of the building, must take appropriate protective measures to evacuate and resettlement of people in the building.
7. Enter the site personnel, for the demolition of the operating personnel to prepare a full range of safety and protective equipment, is strictly prohibited under the influence of alcohol, hot weather attention to temperature control and cooling.
8. Construction stops, should cut off the power supply, check the site to confirm that no unsafe factors before leaving.
9. Construction found unsafe factors should be removed in a timely manner, otherwise the operator has the right to refuse to work. When the construction site has overhead lines or cable lines, should get in touch with Party A, take protective measures to confirm the safety before construction.
10. Before the demolition work, the construction unit should check the situation of all kinds of pipelines in the building, and confirm that all cut off before the construction (transmission devices reserved). In the demolition project operations, found unknown objects, should stop construction, take appropriate emergency measures to protect the scene, and promptly report to the relevant departments.
11. night construction to strengthen the lighting, up and down the cross work when playing a protective platform, and send a special person to monitor, coordinate with each other, shall not be thrown downward at will.
12. According to the demolition project construction site operating environment, should develop appropriate fire safety measures. The construction site should be set up fire truck access, to ensure adequate fire water. When the site is heavily oiled, equipped with sufficient fire extinguishing equipment, and do a good job of fire prevention and anti-skidding.
VIII: Environmental protection measures and civilized construction
1. Set up distinctive and eye-catching signs, signboards and notices within the scope of construction sections.
2. Machines and materials should be stacked neatly, and residual materials should be cleaned up in time.
3. demolition operations, the platform is strictly prohibited on the gathering of people or stacking of materials, operators should stand in a stable structure or scaffolding operation, the demolition of the components should be placed in a safe place.
4. The waste oil waste on the site shall not be discharged randomly, and shall be centralized to be handled together.
5. After dismantling, clean up the site to do the work, material, site clear.
For reference