What Are As-Built Drawings?

The as-built drawing is the drawing drawn by the construction unit according to the actual conditions of the construction at the time of completion. Because it is inevitable to modify during the construction process, in order to allow the customer (construction unit or user) to understand the civil engineering and building construction more clearly In engineering, electrical installation projects, actual directions of pipelines and other equipment in water supply and drainage projects, the state stipulates that after the project is completed, the construction unit must submit a completion plan.

1. As-built drawings rewritten using construction blueprints;

2. Modify the finished drawing on the sulfuric acid paper;

3. Re-drawn as-built drawings;

4. As-built drawing drawn with CAD.

To understand the role of as-built drawings in all aspects of society, first look at the characteristics of construction engineering.

The first feature is the large size of construction products, which generally contain hidden projects. The completion drawing of a construction project is a feedback of design information. Unlike a design drawing, it can reflect the engineering entity most realistically, accurately, and systematically. It is like a manual for an industrial product, and product use and maintenance management cannot be separated from it. Because there are many hidden parts in construction projects, like some mechanical and instrument products, there are no problems during use. They can be shown to technicians, and they can be disassembled for inspection and maintenance. These are often impossible for construction projects. To solve the problem, you have to rely on the as-built drawing and as-built data. Therefore, in the scientific management of construction engineering and underground facilities, the completion map is very important. ^[1]

1. Role in new construction, reconstruction, expansion and restoration projects

When a project starts construction, it is generally necessary to understand the situation of surrounding projects through field surveys and consulting the original engineering drawings, especially when laying underground pipelines or performing maintenance, it is necessary to grasp the direction of the original underground pipelines through the completion drawings, The detailed locations of pipe diameters, elevations, turning points, and intersections cannot be carried out; otherwise, reconstruction and expansion projects are carried out on the basis of the original projects. Therefore, the structural conditions of the original buildings can only be ascertained through the construction completion drawings. This work was realized. For example, if a water plant converts an advection sedimentation tank into a slant tube sedimentation tank, the original project completion drawing is used to make the reconstruction project go smoothly. After the reconstruction, the daily water supply will increase by 100,000 tons, which is more than a new sedimentation tank with a daily water supply of 50,000 tons. Save investment of 3 million yuan, and supply water two and a half years in advance; for example, if the construction period of a gymnasium is very tight, after the Cultural Revolution, the gymnasium was designed and constructed, and no completion drawing was found. The design drawing was found in the design institute. Reconstruction, the maps do not match, causing great losses; the restoration project is due to natural disasters, war or man-made disasters, etc., causing the original building or facility to be partially or completely damaged. In the disaster relief and restoration project, it is also necessary to use the completed map Otherwise, it will inevitably have serious consequences. For example, a fire in a city's oil depot caused delays in the rescue time due to the failure to provide a systematic pipeline completion plan, which caused serious economic losses. Later, it had to be farther away. The original pipeline drawings were transferred from the field design department and the underground oil pipelines were taken. The lessons learned are that the fire can be extinguished only by the emergency measures of segmented isolation.

2. Role in urban planning, construction, and management

The as-built plan is not only an important basis and evidence in urban planning, construction, and management, but also an indispensable basic data in urban planning, construction, and management. The development of modern industry determines that the modern city has become a multifunctional, multi-level, multi-factor integrated organism. With the development of the city, the degree of subjectivity of the city is getting higher and higher. There are more and more hidden projects. In this intricate organism, comprehensive coordination and management need to be strengthened. To this end, it is necessary to understand the interrelationships between various construction projects with the help of as-built drawings. The overall layout of the project construction is to coordinate the relationship between the project plan and urban planning, the relationship between the scale of the project and the urban infrastructure, and the relationship between the individual project and the group. Only through strict unified management can urban construction be organized. Otherwise, it will cause chaos, imbalance, and endless troubles. In these coordinated managements, the completion drawing and engineering data of the construction project play a guarantee role. In detailed planning and design, you also need to have relevant information in order to study road sections and elevations, study building distances, floors, and shapes, and specifically arrange public buildings, green spaces and integrated pipelines, and reasonably arrange traffic. ^[1]

The requirements for drawing the as-built plan are mainly reflected in the following fourteen contents:

First, the as-built drawing should be new or clean

1. Use the construction blueprint to redraw the completed drawing ^[3]

1. Completion plans should be systematically classified and sorted according to the unit's project and according to the specialty.

2. For any project constructed in accordance with the construction drawing, the as-built drawing preparation unit shall affix the as-built seal in the blank space near the drawing of the construction drawing (clean blueprint), and the relevant person shall sign the name in person.

3. For general drawing changes, the preparation unit may directly redraw on the construction drawing according to the design change basis, indicate the basis for the change and modification, and affix and sign the completion stamp.

4. Any major changes or changes found in the structural form, process, floor layout, project, etc. cannot be redrawn on the original construction drawing, the as-built drawing should be re-drawn, and the as-built stamp must be stamped. The re-drawn drawing must have

Completion plan rule one

In the "Administrative Regulations on the Construction of Technical Documents for Municipal Infrastructure Engineering" (City Construction [2002] No. 221), there are the following provisions ^[4] :

1. After the project is completed, the as-built plan shall be arranged in time. The drawing of the as-built drawing shall comply with the following principles: (1) Where there is no change in the construction according to the drawing during construction, the new original construction drawing shall be marked with the "as-built drawing" as the as-built drawing. (2) If there is no major change, the modification shall be depicted on the original construction drawing as it actually occurred, and the change or negotiation number shall be indicated, and the "as-built drawing" mark shall be used as the as-built drawing. (3) Any structural changes, process changes, floor layout changes, project changes, and other major changes; or non-significant changes that are difficult to express clearly on the original construction drawings, should be redrawn.

2. When redrawing the completed drawing, you must use the black drawing ink that does not fade.

Completion plan rule two

In the "Interim Provisions of the State Construction Commission on the Completion of Completion Plans for Capital Construction Projects" ([82] Jianfa Shizi No. 50), there are the following provisions ^[4] :

I. The completed construction plan is a technical document that records the actual situation of various underground buildings and structures on the ground. It is the basis for delivery acceptance, maintenance, reconstruction, and expansion of the project. It is an important technical file of the country. Construction, design and construction units and competent authorities across the country. We must attach great importance to the preparation of the as-built plans and earnestly implement these regulations.

2. Completion plans should be prepared for all new construction, expansion, and reconstruction of capital construction projects, especially hidden parts such as foundations, underground buildings, pipelines, structures, wells, tunnels, bridges, tunnels, ports, dams and equipment installation . For the preparation of various as-built drawings, it is necessary to make concealed engineering records in a timely manner during the construction process (not after completion), and arrange the design change documents to ensure the quality of the as-built drawings.

3. The form and depth of the as-built drawing shall be treated differently according to different situations:

(1) Where there is no change in the construction according to the drawing, the construction unit (including the general contractor and subcontracted construction unit, the same below) will be stamped with the "as-built drawing" mark on the original construction drawing as the as-built drawing.

(2) Where there are general design changes during construction, but the original construction drawing can be modified and supplemented as the as-built drawing, it may not be redrawn, and the construction unit is responsible for indicating the modification on the original construction drawing (must be a new blueprint) Part, accompanied by a design change notice and construction instructions, and stamped with the "as-built drawing" mark as the as-built drawing.

(3) Any structural changes, process changes, floor layout changes, project changes, or other major changes that are not suitable for modification or addition on the original construction drawings should be redrawn after the change. For design reasons, the design unit is responsible for re-drafting; for construction reasons, the construction unit is responsible for re-drafting; for other reasons, the construction unit shall draw the drawings by itself or commission the design unit. The construction unit is responsible for stamping the "as-built plan" mark on the new plan and attaching the relevant records and instructions as the as-built plan.

When major alterations or extensions involve changes to the original project, the as-built drawing data of the relevant project shall be consolidated and archived, and necessary explanations shall be added to the original pattern roll.

(3) The as-built drawing must be consistent with the actual situation. The quality of the drawings must be ensured, and the specifications must be unified. The drawing must be clean and clear. The as-built plan shall be reviewed and signed by the technical person in charge of the construction.

4. The summary and arrangement of the completed drawings shall be treated differently according to the following circumstances:

(1) Each subcontracting unit that implements the general contracting system of a construction project shall be responsible for preparing the as-built drawings within the scope of the subcontracting. In addition to preparing the as-built drawings for self-construction, the general contracting unit shall also be responsible for summarizing and finishing the compilations completed by each subcontracting unit Illustration. The general contracting unit shall submit to the construction unit the complete and accurate completion plans within the scope of the general contracting unit when handing over the work.

(2) If the construction project is contracted to several construction units by the construction unit or the engineering headquarters, each construction unit shall be responsible for preparing the completion drawing of the contracted project. The construction unit or project headquarters is responsible for the collection and arrangement.

(3) When signing a contract for a construction project, issues such as the preparation, inspection and handover of the completion drawing should be clearly specified.

V. Before the completion and acceptance of the project, the construction unit shall organize, urge and assist the design and construction units to inspect the construction drawings for their respective responsibilities. If inaccuracies or shortages are found, measures shall be taken in time to modify and supplement them. The as-built drawing shall be used as one of the conditions for acceptance of the project. If the as-built drawing is inaccurate, incomplete, and does not meet the requirements for filing, it cannot be submitted for acceptance. In special cases, the completion plan can also be submitted in accordance with the time limit agreed upon by both parties at the time of delivery acceptance.

6. The completion plans of large and medium-sized construction projects and urban residential quarters must not be less than two sets. One set is handed over to the production and use unit for storage, and one set is handed over to the relevant competent department or technical archives department for long-term preservation, which is of great importance to the nationwide construction. Projects (such as the Capital Airport, Nanjing Yangtze River Bridge, etc.) should be added to the National Archives for preservation. The completion plan of a small construction project shall not be less than one set and shall be transferred to the production and use unit for storage. The construction drawings that need to be added due to the preparation of the completed drawings shall be provided by the construction unit to the construction unit in a timely manner, and when the contract is signed, the number of additional copies shall be clearly specified.

7. After the completion of a large-scale project, if the above-mentioned as-built drawing still fails to meet the requirements, the as-built drawing may be redrawn. The construction unit is responsible for organizing the drawing, and the design and construction unit is responsible for providing project change data.

8. The expenses required for the preparation and arrangement of the completed drawings are caused by design reasons. The design unit shall be responsible for the preparation of the expenses required by the construction unit and shall be settled by the construction unit in the cost of the construction and installation project. The cost shall be settled by the construction unit in the investment in infrastructure construction; the cost that needs to be copied and supplemented after completion and use shall be settled by the user unit.

Nine, in order to do a good job in the preparation of the capital construction project completion map, the competent departments may formulate relevant rules according to specific circumstances.

X. These Provisions shall be implemented on a trial basis from the date of ratification and promulgation. Relevant past regulations that conflict with these regulations shall be implemented in accordance with these regulations.