| Customization: | Available |
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| After-sales Service: | Online Technical Support, Onsite Training |
| Warranty: | 1 Year, 6 Months |
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As one of the leading heavy steel fabricators in China, we have engaged in quite a lot of Chemical production line heavy steelworks. Except the China standard fabrication, we are also quite capable to do the steel fabrication based on America standard, Europe standard, UK Australia standard and so on.
Following is a typical petrochemical plant project introduction:
1. Project overview
This project is a reconstruction project for the polypropylene plant and platform of the refinery chemical company. It is divided into 1-4 axes and 5-7 axes. A 200mm high brick wall is set up around the activator tank on a level 13.000 level. Apply 20mm thick 1:2 cement mortar cover on the outside, embed parts in the cast-in-place layer and the corresponding positions in the ring beam, and connect the steel frame to the embedded parts. Ladder composite board, fixed on the steel frame with self-tapping bolts.
2. Construction organization and deployment:
2.1 Organization:
The project is constructed in accordance with the project method, the project manager responsibility system is implemented, and the project method construction is carried out. The project team is composed of personnel with rich construction experience sampled by the company, and the project manager department responsible for the construction of this project is formed. According to the company's "Quality Manual" Provisions, improve the organizational structure of the project management department.
2.2 Construction management objectives:
2.2.1 Quality standard: qualified
2.2.2 Construction period target: 10 days for demolition, 20 days for steel structure, 15 days for roof panels, wall panels, doors and windows, and 8 days for others.
2.2.3 Economic indicators: keep the capital at a low profit, and use scientific management and advanced technology to make profits.
2.2.4 Safety indicators: prevent fatalities and serious injuries, and control the frequency of minor injuries below 15‰.
2.2.5 On-site management: the construction site that meets the standard.
3. Construction plan
In this project, civil construction is carried out first and then installation is carried out. Civil construction is carried out first and then steel structure.
3.1 According to the characteristics of this project, two twelve-ton truck cranes are used for vertical transportation.
3.2 Steel bars and wood products are processed and produced at the construction site. The formwork is made of steel formwork, and wood formwork is used to supplement when the modulus is not enough. Some bases of steel structure are processed and installed on site.
3.3 Division of construction stages
According to the characteristics of this project, the whole project is divided into three stages: civil engineering - main steel structure project - decoration part; according to the construction characteristics of different stages, labor force, materials and machinery are arranged, construction progress is controlled, and construction period is arranged.
3.4 The construction sequence of each part of the project
3.4.1 The general principle of foundation construction is the construction sequence of "first civil construction, then steel structure, and attention to waterproofing".
3.4.2 The main project shall be installed after civil construction, and water and electricity shall be interspersed.
4. Main engineering construction technical measures:
4.1.1 Horizontal position test: Receive the positioning reference line provided by the construction unit in written form, and use the theodolite to test the main control axis of the proposed building based on this point, with a distance of 3 meters on the extension line at both ends of the main control line Half of the permanent axis control piles and 10 meters should be set up and protected for inspection and review purposes.
4.1.2 Elevation measurement: Based on the value of the benchmarking point provided in writing by the construction unit as the base, use the theodolite to guide and measure the elevation value of the benchmarking point to a place near the project that is not easy to be damaged for protection, so as to conduct pilot measurement and proofreading of the elevation of the project . This project is an extension project, and the relative elevation can be determined independently.
4.2 Rainproof and drainage:
During dismantling and construction, pay attention to the protection of the original components, and prepare waterproof equipment and materials. Try not to interfere with lower-level work.
4.3 Civil engineering
4.3.1 Removal
Pay attention to dismantling with machinery, do not smash and chisel again, and protect the original structure and wall.
4.3.2 Joint surface treatment
The structural layer of the building is chiseled, fully wetted and then poured with 80mm thick ceramsite concrete (C20). There are ring beams around the outside.
4.3.3 Rebar construction:
(1) After the steel bars enter the site, they should be checked, sorted, stacked by special personnel in a timely manner, sampled for inspection, and marked, and the stacking site should be dry.
(2) Reinforcement production: Reinforcement production shall be carried out in strict accordance with the method indicated in the construction drawing. After the rebar is formed in the on-site rebar processing shed, it shall be bound on site.
(3) Rebar binding:
a) After the cushion layer is laid, pop out the edge line of the bottom plate, the center line and edge line of the column, and the position line of the steel bar binding. Before binding, check the specifications and variety of steel bars, and then bind them.
b) When tying steel bars, a protective layer shall be reserved according to the design regulations, and there shall be no negative error. The steel bars are firmly bound with splayed buckles to prevent the concrete from being bumped and shaken, which will loosen the bindings and cause the steel bars to be exposed due to the displacement of the steel bars.
4.3.4 Formwork construction:
There is only one ring beam and ceramsite concrete floor superimposed layer ring beam formwork support setting focus, pay attention to straightness.
4.3.5 Concrete construction
(1) Before pouring, check the elevation and axis to be correct and check the steel formwork to meet the requirements before pouring and tamping the concrete.
(2) Continuous construction of foundation pouring, and special attention should be paid to the re-measurement of the elevation and position of column insert bars and pre-buried anchor bolts during the concrete pouring process to prevent tilting and displacement during the pouring and vibrating process. Vibration adopts plug-in vibrator. Requires vibrating compaction.
(3) When pouring concrete, set up a movable operating table, and pour the concrete directly into the mold with a trolley.
4.4 Steel structure engineering process control
4.4.1 General Specifications
The technical department shall make the identification method of all components, and issue a list of identification specifications to relevant departments and teams. Specifications, models and locations of welding wires, fluxes and electrodes required for special welds shall be indicated on the process drawing. Special welds do not need to be welded to the edge of the component, and should be clearly marked on the process drawing. All bolted connection parts must be marked with a template, and attention should be paid to the direction and orientation. Those that can be drilled must be drilled. For the construction of new technology and new materials, welders must be trained and qualified before they can work. And need to master the basic knowledge in "Q235 Welding". All electrodes and fluxes must be used and stored after being dried in accordance with the welding specifications, and the electrode insulation cylinder must be used correctly.
Welding of material components must first be done as test pieces. 24 hours after the completion of the first pass of each weld, use a magnifying glass or an ultrasonic flaw detector to inspect the weld for delayed cracking. If cracks and carbon arc gouging are found, re-weld or use a new welding process and new welding specification to redo the test piece.
For steel components, if there are strip-shaped dense pores on the door-type welding machine, they should be treated as welding cracks, and must be planed and re-welded.
For steel components, the edges must not be scratched, otherwise they must be ground and repaired.
For steel components, if the welding seam needs to be welded twice, or more than twice, the slag should be removed after the first welding to check whether there is any crack. If there are cracks, it must be planed and re-welded.
4.4.2 Welding process of steel column and steel beam
Assembling large sample of steel column and steel beam - assembling connecting plate - drilling connecting hole - butt flange - connecting welding port - welding - flame straightening - pre-assembly - assembling beam center connecting flange - - Measurement - welding center flange - cleaning slag, burr - rust removal, painting
4.4.3 The above key points shall be controlled by the technical personnel of the control department in charge of the technical project, and the quality inspectors of the quality control department shall strictly follow the above-mentioned process regulations. If problems are found, they shall promptly report to the technical department.
4.5 Production schedule control
We will make production preparation according to the content of the engineering contract and formulate production preparation design.
4.5.1 Production staff
(1) There are 7 electric welders in the workshop, 5 equipment operators, 3 auxiliary workers, 3 warehouse loading and unloading workers, and 2 mechanical maintenance workers, totaling 20 people. According to the quantity of the project, the production department will designate the production personnel of each part.
(2) Unit preparation:
The production workshop is now divided into 7 groups, which can meet the needs of the production process. Special attention should be paid to the individual groups that affect the progress of the project. The first and last procedures should be strictly demonstrated, and personnel should be supplemented when necessary. To meet the requirements of the next process and entry time.
(3) Implement the importance of daily maintenance of equipment for equipment operators, and achieve "three good and four thoughts" to ensure the integrity rate of equipment during use.
(4) Carry out necessary publicity and supervision work for plant auxiliary workers, plant loading and unloading workers, and mechanical maintenance workers, so that they can fully ensure front-line production and equipment safety. We should not waste too much in auxiliary working hours, and take corresponding measures to meet the 24-hour work of front-line production.
4.5.2 Production equipment
(1) 4 sets (sets) of C-shaped steel production equipment in the workshop, 6 sets (sets) of drilling holes for parts, 6 sets (sets) of electric welding machines, 2 sets (sets) of cranes and 3 sets (sets) of processing equipment. According to the engineering volume and production progress, the production department draws up the production design and usage, improves the utilization rate of the equipment, and tries not to add other equipment while meeting the progress of the construction period.
Specification:
| Steel Grade | Q235b, Q345b |
| Marerial | Galvanized steel |
| Width | 310-500mm |
| Thickness | 0.15-3.2mm |
| Weight coating | 30-275g/m2 |
| Application | All kinds of steel structure buildings |
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