1. Characteristics of subway projects

Subways are playing an increasingly important role in facilitating urban citizens’ travel. Currently, nearly 30 cities in China are building or preparing to build subways. . It mainly has the following characteristics: saving land, reducing noise, saving energy, reducing pollution, and conforming to the national energy conservation and emission reduction policy. But at the same time, it also has the disadvantages of high construction cost, long construction period, complicated construction procedures, diverse forms of structures, and high construction risks.

2. Characteristics of subway construction internal data

Internal data is an important carrier that directly reflects the quality control of the construction process and is an important basis for future subway completion acceptance and opening operation management. , Strengthening and standardizing the internal data collection during the construction stage is an important part of the current subway project construction management, and it is also a major aspect that reflects the level of subway project construction management.

1. Construction technical data is one of the basis for urban construction and management. After the construction unit completes the acceptance and delivery for a certain period of time, due to quality hazards during the construction or ineffective rectification measures, the project is likely to have some quality defects. In order to ensure the construction quality and extend the service life of the project, repairs and repairs must be carried out. powerful. This requires consulting the technical data files of the project in order to take appropriate and effective measures. Engineering technical planning and design personnel must have a detailed understanding of the structural form, line direction and layout of the project in order to formulate correct plans and measures. This information can be obtained by consulting the technical data files of the project.

2. Construction technical data are objective witnesses of project quality. Quality is "the sum of the characteristics and characteristics that reflect the ability of a product or service to meet explicit or implicit needs." As far as subway engineering is concerned, a station, a section, and a signal line should meet the functions and use values ??required for construction or connection, and should comply with the design, specification requirements, and quality standards stipulated in the contract. The construction process of the project is the process of quality formation. The quality of the project should be witnessed by corresponding technical data during the formation process.

3. Construction technical data is a comprehensive reflection of the management level of the construction enterprise. The construction technical management data of the construction unit are transformed from the technical documents and materials gradually formed during the construction process. It has the same importance as completing the main body of the project and is part of the project contract. It is an important document that comprehensively reflects and records the main body of the construction unit and the construction process. It is one of the direct results of the construction unit's construction and plays a guiding and basis role in the construction. It represents the comprehensive management level of construction enterprises.

Subway engineering involves many majors, including nearly 20 to 30 majors such as structure, architecture, decoration, ventilation and air conditioning, water supply and drainage, fire protection, comprehensive monitoring, power supply, communications, and civil air defense; the time span is large, It takes at least 6 years from feasibility study, project approval, project planning, survey, design, bidding to construction, handover and acceptance; it involves many units, including survey, professional design, professional construction units and supervision units; construction There is a lot of content. As far as civil construction is concerned, there are underground, above-ground, elevated stations, bridges, houses, stations, tunnels, etc. Faced with so many majors, responsible units, and construction projects, unified data compilation standards, systems, and procedures should be formulated and further refined so that the numerous data can finally reach system standards, clear and easy to check.

Subway engineering data mainly includes eight aspects: management data, technical data, quality control data, construction records, measurement, monitoring data, safety and functional inspection data, and main function spot inspection records, acceptance data, and drawings. Basically It is different from general construction projects, but it also covers some specific contents in municipal administration, railways, electric power and other majors.

3. Requirements for internal data collection

“Complete”, “accurate”, and “strict”: “Complete” means working hard to complete the internal data, so that documents and information The items are complete, and there are no missing files or insufficient frequency. "Accuracy" means strictly controlling the accuracy of internal data collection to ensure that the content and data filled in the data are accurate and can withstand scrutiny and inspection. "Strict" means strict review of the format and organization of internal data, and unqualified internal data are strictly prohibited from entering the engineering archives.

IV. Problems, causes and countermeasures in the current data compilation process

In the past two years of inspection and acceptance of the completion data of Xi’an Metro Line 2, some problems have been discovered , and thought about the reasons for these problems. In summary, the reason is also very simple, that is, whether the leaders pay attention to it and whether the specific personnel are responsible. Quite a few projects usually do not pay attention to the management of internal data, and there is a common phenomenon of "emphasizing external work and neglecting internal work". Moreover, the internal work data is sorted out in stages, only "organizing" but not "managing", resulting in internal work. Logical and data errors in the data are "rife"; in addition, the engineering management personnel and the archives management personnel are not familiar with each other's business, have a poor sense of work responsibility, and their positions are not fixed, and the work continuity is poor and out of touch, resulting in internal data compilation. Repeated rework often occurs. Specifically reflecting the following practical issues:

1. Personnel issues.

Project managers have incorrect ideas about who compiles the information. Most people think that information is just a matter of arranging a person to sit in a room, fill in the form and print it out in front of the computer. In fact, this is not the case. I think information personnel cannot work behind closed doors. They should understand the construction procedures, content and progress, and should also be familiar with the on-site work. What to do, otherwise the information produced will have no credibility.

The data compilation and compilation staff are unstable and change frequently. The data compilation work spans a long time, is boring, and does not provide a sense of accomplishment like completing the entity. It has a greater impact on personal improvement. Therefore, the technical staff on the project are unwilling to do data work, resulting in frequent replacement of personnel. To solve this problem, on the one hand, unit leaders need to improve the treatment of data compilers, and on the other hand, they need to clarify their responsibilities. Data management personnel are mainly responsible for collecting, organizing and archiving data, not "making" data. First-hand data should be On-site technicians will fill it in, thus ensuring the timeliness and accuracy of the information.

2. Problems with filling in the information

2.1 The filling in the information does not conform to the actual construction content on site. Some construction units did not read the contents involved in the inspection batch form carefully or did not understand it well, and filled in some items that were not related to the construction of the construction site. For example, in the current station structure construction, there are basically no bent steel bars in the main beams or secondary beams, and in the steel bar installation inspection batch form, quite a few units have ticked the information for this project; in the decoration project, the structural columns or circles will be The hook at the end of the beam's steel bar is also understood as bending the steel bar.

2.2 The signers are not uniform and their handwriting is inconsistent.

(1) The signatures of the same person in charge in various materials are inconsistent.

(2) The information filled in by different persons in charge must be written in the same handwriting.

The main reason for this situation is the frequent transfer of personnel in various projects. On the other hand, the data is not submitted in time, and the small amount adds up to the big problem, so there is no time to sign it.

2.3 There is no correspondence between self-inspection data, random inspection data and test data.

(1) The various inspections in the self-inspection data are not filled in in the order according to the construction process. The time sequence between steel bar inspection, formwork inspection and concrete pouring does not correspond. The measurement data and process inspection data do not correspond in time and date.

(2) For the same construction process, the self-inspection, random inspection, and test data do not correspond in time and content. Special attention should be paid to the date before the concrete pouring and the production date of the test piece.

2.4 The logical relationship between data cannot withstand scrutiny. For example, in bored piles, the drilling depth, hole bottom elevation before drilling, sedimentation layer thickness, hole depth and other contents are divided into different testing stages and filled in different forms, but there is a certain logical relationship, so we must carefully Calculation; there is also a certain logical relationship between the data in the subgrade filling form such as elevation inspection, empty pavement thickness, compaction thickness inspection, etc.

2.5 The filled-in content does not comply with the drawings and specifications. All main control items in each inspection batch must be qualified, and the pass rate of general items must be above 80%. Find out whether the items in the form are quantitative or qualitative indicators, and whether to fill in deviation values ??or check boxes. These should be filled in according to the site conditions and specification requirements. The data in the form comes from the construction site, but it should meet the design and specification requirements.

2.6 The order and type of forms should be determined according to the process of each sub-project. Generally, each process must be recorded and inspected, and no items should be missed.

2.7 There are obvious data errors, alterations, and omissions in the data.

2.8 Fill in the form with illegible handwriting. Especially for signatures, you can often see the signatures of some managers so flamboyant that they are difficult to identify.

The above problems are problems in specific materials, and they can be solved in three words: strict, precise and detailed. "Strict" means a strict and rigorous attitude. Establish a good mentality from the beginning. If you have a correct attitude, you will have good results. You must take the internal information seriously from the beginning and don't have the mentality of completing the task. ; "Fine" means to be proficient in internal industry knowledge, so that internal industry information does not stay on the surface, but has essence and spirit, and is accurate and precise; "fine" means to be careful, details determine success or failure, and often some details will determine a thing. Whether things are successful or not, details are often overlooked by people. In the process of internal management, details are also particularly important. Pictures and texts do not match, text is different, and handwriting is illegible. This can be said to be the most difficult thing in internal management. It is these problems that are prone to occur, resulting in the rework of a large amount of data and a waste of manpower and material resources. Therefore, in the initial stage of sorting, internal managers should treat it carefully and strictly control it, and never make such low-level mistakes. You also need to be able to refine and refine the internal industry information so that it is comprehensive.

V. Ideas and Suggestions

1. The management of internal industry data is a long-term, uninterrupted, and regular process. For data management and construction units, special agencies should be established. Arrange personnel to supervise, guide and inspect the data compilation work of each project;

2. Ensure the authenticity and integrity of various technical data. Authenticity is the soul and integrity is the guarantee.

3. Early intervention should be made to formulate a list of archived materials and filling requirements;

4. Strengthen training and organize various units to communicate and learn from each other;

5. Strengthen the supervision function, and require strict supervision of daily materials;

6. Contact and communicate with local archives management departments, and ask them to inspect together when necessary, so as to detect and solve problems early.

Through engineering practice, we still have some problems in the management of internal data preparation and archiving, resulting in incomplete, inconsistent, and unsystematic internal data. The subway project is a systematic project that involves many aspects. If the responsible personnel of each unit can be strict, precise and detailed, I think the internal data management work will be able to be comprehensive, systematic and standardized, and it will definitely be able to leave information for the construction process. Next testimony.