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1、 Breakdown of construction content of weak current system The weak current system can be divided into three types according to different construction sites:
(1) The first category is the construction of weak current system in the station hall and platform layer. The specific work includes embedding cable protection steel pipes in the wall and on the ground in the equipment area, installing AFC trunking on the ground in the station, installing branch trunking and wiring on the platform in the station hall, installing AFC gate ticketing, and installing computer network and peripheral PIS equipment;
(2) The second type is the construction of weak current system in the tunnel, mainly including the installation of bracket, optical cable laying, PIS trackside equipment, repeater, video monitoring, business telephone and other equipment;
(3) The third category is indoor equipment installation, mainly including the installation of indoor trunking and cable rack, equipment installation, equipment cable laying and installation, etc.
During the construction process, it is necessary to know Party A's general schedule for the project in advance, especially the schedule of completion acceptance nodes and trial operation nodes. For the first type of construction task, it is necessary to know and master the construction progress and construction plan of the civil engineering unit at any time in the early stage of construction, find a suitable working surface, install the embedded pipelines on the wall and the ground in the equipment area, and check the construction drawings with the civil engineering unit in advance before construction; The second type of construction task is at the beginning of the construction in the tunnel. After the track elevation is determined, the interval support installation can be carried out. After the track laying is completed, the photoelectric cable laying and the interval equipment installation can be carried out; The third type of construction task is mainly in the middle of the construction period, and the main work is to install the bridge and indoor equipment on the station hall floor and platform floor. The weak current integrated pipeline is complex in the station, so it is necessary to conduct a comprehensive joint review of the pipeline drawings of each station before construction, especially the pipeline verification with other disciplines, to prevent rework caused by the mutual influence of pipeline positions. The construction time node shall be inverted according to the closing time node requirements, and timely adjusted according to the on-site construction progress and civil construction progress, and corresponding material and personnel input arrangements shall be made. 2、 Key points of construction preparation 2.1 After entering the site, organize relevant personnel to get familiar with the construction drawings and relevant technical data, survey the site, fully understand and master the system design scheme and functional characteristics, and make technical disclosure. Secondly, organize special technical training to enhance quality awareness. (1) Before the commencement of the project, the joint review of drawings will be organized, and the data of the changed design will be implemented and solved as soon as possible, so as to facilitate the processing, ordering and construction organization.
(2) According to the characteristics of the project with many types and specifications of materials, the order quantity shall be put forward in time, and special personnel shall be assigned to implement the delivery date. (3) The phased construction organization design and sub divisional construction scheme shall be well prepared along with the construction progress, and the approval, implementation and disclosure shall be well done before construction. (4) Check and verify whether there are contradictions in the equipment installation drawings of various disciplines, and consider the method of cross connection during construction. Define the internal and external interface items by getting familiar with the drawings, and determine the interface preparation related to the construction of relevant units.
2.2 Preparation of construction tools and instruments According to the construction needs of the weak current system, purchase and prepare construction tools and instruments in advance, prepare all relevant quality and inspection qualification certificates, and timely prepare the mobilization and inspection data of tools and instruments. 2.3 The labor arrangement plan shall reasonably plan the labor bidding demand according to the quantities and construction period, and prepare the labor demand schedule according to the project schedule. The model labor team adopts the method of public bidding, and selects the model labor team with rich experience, excellent technology and excellent workmanship. 2.4 Temporary facilities Set up office, accommodation, central material warehouse and other facilities according to the needs of site construction. 3、 Cooperation measures and key points with all parties of the project 3.1 Cooperation measures with the owner (1) The owner is in the leading position in the project implementation process, so after winning the bid, we should contact the owner in time to fully understand the owner's needs and relevant arrangements; (2) Prepare the implementation construction organization design, construction scheme of divisional and subdivisional works, monthly construction schedule and other documents according to the actual situation on site, and submit them to the Owner for review in a timely manner; (3) During the construction, the on-site project quality and progress management shall be carried out in strict accordance with the construction organization design approved by the Owner; (4) During the construction of each process, the Owner shall be actively invited to inspect the construction process. Before the acceptance of each sub project, the Owner shall be notified in advance to participate. All quality problems raised during the acceptance process shall be rectified in a timely manner without delay, and the rectification results shall be reported to the Owner in a timely manner and invited to review; (5) The parts and practices not specified in the drawings shall be determined in the form of contact list in a timely manner after reaching an agreement with the owner and obtaining the design consent, and shall not be handled without authorization.
3.2 Cooperation measures with the supervision unit (1) Prepare practical construction organization design, construction scheme of divisional and subdivisional works, monthly construction schedule and other documents according to the actual situation of the site, and submit them to the supervisor for review in a timely manner; (2) During the construction process, the on-site project quality and progress management shall be carried out in strict accordance with the approved construction organization design; (3) During the construction of each process, actively invite the supervisor to inspect the construction process, carefully listen to the supervisor's opinions and requirements on the construction process, timely rectify the quality problems raised during the acceptance process, never procrastinate, and timely report the rectification results to the supervisor for review; (4) All equipment and materials used in the construction site shall be submitted to the Supervisor for inspection in advance, and shall be put into use when approved by the Supervisor; (5) Strictly implement the principle of "the previous process is unqualified and the next process is not constructed", accept the acceptance and inspection of the Supervisor on the basis of self inspection and special inspection of the construction project, and timely rectify the existing problems according to the requirements of national and industrial standards. 3.3 Cooperation measures with the design institute (1) Organize professional technicians to participate in the joint review of construction drawings, put forward problems and suggestions in time, especially cross influence and interface problems among disciplines, and assist the design institute to properly handle them; (2) Participate in the selection, selection and ordering arrangement of materials and equipment together with the designer and the owner, and assist the designer and the owner to improve the design content and equipment selection; (3) Actively cooperate with the design institute in the supervision and inspection of the construction process and actively provide cooperation data to ensure the successful realization of the design intent in the construction process; 3.4 Cooperation measures with the civil construction unit (1) Actively contact with the civil construction unit before commencement, and request the owner and supervisor to coordinate and promote the handover of the working face. Clarify the cooperation and coordination relationship between both parties and the scope, interface, responsibility, etc. of construction, and prevent disputes from affecting the project progress; (2) Entering the site for construction shall be subject to unified arrangement, unified and balanced deployment, and the comprehensive schedule shall be arranged in stages, and actively cooperate with each other to provide working faces to reduce the impact of cross construction; (3) The mutual cross construction and mutual influence during the construction period shall put forward opinions and suggestions at the coordination meeting, and obey the unified coordination and arrangement of the Owner; (4) Before the commencement of construction, we will work with the civil engineering unit to carry out detailed acceptance of the reserved and embedded trench pipe holes, and communicate and deal with the existing problems in a timely manner;
(5) Work with the civil engineering unit to formulate the protection system for finished and semi-finished construction products, strengthen self-protection and mutual protection, and eliminate cross contamination and finished product damage. 3.5 Cooperation with the operation unit (1) During the construction process, the operation receiving unit is required to intervene in advance, participate in the whole construction process, and timely find and correct the quality and process problems existing in the construction, so as to ensure the smooth handover in the later period; (2) Communicate and adjust the list of spare parts in the later period in advance and submit it to the Owner for review. After approval, control and submit the material demand plan according to the spare parts handover management method and time node. 4、 Quality assurance measures and key points 4.1 Construction preparation stage (1) Technical preparation: including getting familiar with and reviewing construction drawings; Prepare project construction organization plan, technical disclosure and operation instructions; (2) Material preparation: preparation of material demand plan; Preparation of material management measures; Material inspection, experimental items and third-party inspection units shall be determined; (3) Preparation of construction tools: submit purchase demand of professional tools and instruments according to professional characteristics; (4) Preparation of personnel organization: establish and improve professional construction organization, and fix personnel and posts; Demand planning and mobilization arrangement of framework labor team; (5) Data preparation: confirm various construction tables and process control tables with the supervisor. 4.2 Quality control measures during construction The key point of quality control during construction is to control the quality of each construction process. Specifically, complete inspection records shall be kept for process handover; There are standards for quality card control; Special construction has approved special construction scheme; The technical disclosure shall be delivered to each construction personnel on site; There are records and results of drawing joint review; The quality of materials and equipment entering the site is qualified and there are inspection application procedures; Concealed works have acceptance records, and no acceptance or coverage is allowed; Design change has complete procedures; There are comparison records and recheck records before and after defect treatment; There are special measures and schemes for the protection of finished and semi-finished products. 4.3 The quality control in the later stage of construction mainly includes: preparing complete completion acceptance data; Self inspection and assessment of completed divisional and subdivisional works; Organize preliminary acceptance; Organize joint commissioning and test; Organize defect rectification and review; Organize completion acceptance. V. Construction Period Assurance Measures and Key Points
5.1 The construction period control method uses the bar chart and network chart to determine the overall progress control objectives of the project and the progress control objectives of sub divisional and divisional works, and prepare a detailed schedule. According to the characteristics of electromechanical weak current system itself, each subsystem and phased construction task package are divided in detail. According to each construction task package, the work tasks and construction nodes that need to be completed in each phase are organized and planned, as well as the relevant arrangements before and after. The project progress is depicted in the form of bar chart, which can intuitively reflect the construction task objectives of each stage, the sequence and interdependence conditions of each process, the start and completion time nodes of each process, and thus determine the construction tasks and the resources needed in each construction stage, the demand for personnel, materials and machines in each stage, and the requirements for mobilization time. During the construction process, constantly compare the deviation between the actual progress and the progress plan, constantly adjust the demand arrangement of personnel, materials and machines, and actively coordinate with other disciplines and external units that affect the construction progress. 5.2 Construction period guarantee measures (1) Before commencement, prepare the material demand plan provided by Party A and submit it to the Owner for approval. Once the commencement date is determined, the first batch of materials are required to arrive at the site warehouse on time. The mobilization time of subsequent batches of materials and equipment shall be determined according to the needs of on-site construction, and the arrival time shall be in advance; (2) Scientifically arrange the construction process, actively coordinate with the civil engineering unit on the construction work surface, avoid the slowdown caused by people's work, and reasonably arrange personnel to avoid the situation of people's work; (3) During the construction process, hold a regular project meeting every day to arrange the tasks of the day, solve the problems encountered the previous day without delay, and report to the project leader or the supervisor and the owner for coordination and solution if the problems cannot be solved on the same day; (4) At the beginning of each construction, the first article calibration system shall be implemented to avoid large area loss of materials and construction period caused by later rework; (5) After the construction of each divisional and subdivisional project is completed, the project data shall be sorted out in a timely manner and the signing procedures shall be completed;
