If it is really necessary to change the construction drawing design under special circumstances, the design unit shall make the design change, the construction unit shall report to the competent civil air defense department, and the change can be made only after it is reviewed and approved by the review organization.
The qualification of civil air defense engineering supervision enterprises is divided into three levels: Class A, class B and class C.
enterprises that meet the corresponding conditions such as the nature of enterprises specified by the competent department of civil air defense and obtain the qualification of civil air defense engineering supervision with the permission of the competent department of civil air defense may undertake supervision business within the scope of permission.
The upper reinforcement of the basement foundation bottom plate must pass through the lower part of the main reinforcement of the upper layer of the foundation anti beam.
The beam height shall be controlled according to the height of the building floor..
The drainage system is embedded with explosion-proof wave floor drain.
2.
The lower side of the door frame is the same height as the building floor, and the binding height of reinforcement should be ≥ 100mm.
The explosion-proof floor drain pipe is made of galvanized steel pipe, and the connection method is wire connection, which needs hemp wire and white thick paint.
shall be embedded in the civil air defense door frame of water collecting well 4, and shall be bound in place together with the bottom plate reinforcement.
The thickness of the protective layer tie bar civil air defense enclosure structure is subject to large impact load in wartime.
For example, we have Nanjing civil air defense project quality supervision station in Nanjing.
Too long will cause insufficient concrete protective layer or exposed reinforcement, too short and insufficient thickness of base plate.
This is of great significance to correctly implement the design intention during construction, deepen the understanding of the difficulties and doubts in the design documents, and ensure the project quality.
Multi storey basement For multi-storey basement, it is recommended that the design unit set the civil air defense basement at the bottom.
The construction unit shall sort out the meeting minutes for the joint review of drawings, and all parties participating in the meeting shall countersign.
The setting of quincunx tie bar is conducive to shear resistance, prevent fragments from falling off and maintain the integrity of the concrete.
during floor construction, the system shall be embedded into the floor.
Two beams shall be set in the opening and closing direction of civil air defense door leaf; 2.
3.
The elevation of floor drain cover plate shall be 5 ~ 10mm lower than the floor, two courses of asphalt paint shall be applied, and butter shall be applied on the branch opening to ensure that the cover plate can rotate flexibly in the floor drain branch opening.
Check and review the drawing of civil air defense door opening and closing conflict When reading the drawings, the construction unit shall carefully read the two sets of drawings in wartime and peacetime (some civil air defense projects are designed by two design units in wartime and peacetime), especially the connecting parts of the two design institutes, such as the roof of civil air defense projects.
What is civil air defense engineering quality supervision? The quality supervision of civil air defense engineering is a kind of administrative supervision.
The leakage of water collecting well and drainage pipe on the bottom plate cannot be rectified.
Focus on six conflicts: (1) the opening and closing of the door shall not conflict with the parking space (especially the mechanical parking space); (2) the opening and closing of the door shall not conflict with structural members such as beams and columns; (3) the opening and closing of the door shall not conflict with the ventilation duct; (4) the opening and closing of the door shall not conflict with the water supply and drainage pipeline; (5) the opening and closing of the door shall not conflict with the cable tray; (6) the opening and closing of the door shall not conflict with the protective equipment (civil air defense door, valve, poison filter tank, etc.).
The spacing between two beams should be controlled at 50-100mm; 3.
After receiving the qualified construction drawing design documents reviewed by the construction drawing review organization, all participating units of the project shall participate in the drawing joint review meeting presided over by the construction unit, sort out the list of joint review questions, and submit it to the design unit at the time agreed by the construction unit before the design disclosure.
The anchor hook of civil air defense door frame shall extend into the structural layer.
It is strictly prohibited to pour and tamp concrete without embedding various civil air defense protective equipment and facilities (such as explosion-proof floor drain, water collecting well, door frame, through wall pipe, etc.).
It is strictly prohibited to pour and tamp concrete without the acceptance of concealed works reinforcement (without declaration or without the consent of the competent department).
The reviewed construction drawings have legal effect, and no unit or individual shall modify them without authorization.
It is the quality supervision implemented in the whole process.
Post cast strip post cast strip is strictly prohibited to pass through the mouth of civil air defense works, civil air defense doors and partition walls of protective units! If the construction unit finds such phenomena in the design drawings, it shall timely contact and communicate with the design unit to eliminate such phenomena at the source of the design! The strength grade of the material specified in the structure of the bottom plate part 1.
Fixed threshold for the height of civil air defense threshold: generally, the height difference between the threshold and the building floor shall be ≥ 150mm (the threshold of single leaf civil air defense door of steel structure shall be ≥ 130mm), and the binding height of reinforcement shall be ≥ 250mm.
Correct method of movable threshold: 1.
Special institutions authorized by the competent department of urban civil air defense carry out quality supervision.
Once the direction is wrong, the civil air defense door will not work in wartime.
Civil air defense projects must be constructed in strict accordance with the construction drawings.
Drawing joint review 1 design disclosure the construction unit shall require the design unit to disclose the rectification reply (i.e.
The pipe extends into the sump for 100mm, and the steel elbow is welded and connected to the bottom of the sump for 200mm.
design change) of the review opinions put forward by the review organization on the construction drawings one by one, and the design unit is responsible for answering the construction unit’s questions about the design drawings.
The vertical dowel bar of civil air defense wall, the door frame of civil air defense door, anchor hook, splayed stiffener, movable (fixed) threshold reinforcement, etc.
Explosion proof floor drain: it can prevent shock wave and poison from entering the air defense basement in wartime.
The water stop steel plate of the exterior wall shall not be directly butt welded at the 90 degree corner, but shall be bent; The horizontal lap length shall not be less than 100mm, and shall not be less than full welding on both sides; The stirrups shall be connected up and down, and the stirrups of wall attached columns cut by the water stop steel plate shall be overlapped and welded on the water stop steel plate; The height difference between the horizontal construction joint and the bottom plate surface shall be ≥ 500mm.
“Hole diagram” When reviewing the construction drawings of civil air defense engineering (attached type), the construction unit should submit a full set of ground construction drawings (including wind, water and electricity) for review, so as to avoid the problem that the ground equipment pipeline crosses the civil air defense enclosure.
At the same time, the construction unit shall also pay attention to whether there is “drawing of reserved and embedded holes in civil air defense basement” in the civil air defense building and structural design drawings, so as to avoid the problem of opening holes after the completion of the main structure construction.
Movable threshold: there is no threshold under the door, and there is a large and small beam in front of the door.
Each opening of the air defense basement is equipped with a protective drainage system, which is composed of water collecting well, drainage pipe, explosion-proof floor drain, etc.
The opening direction of protective closed door, closed door and hanging plate valve must face the direction of shock wave.
The quality supervision of civil air defense project is based on the national or local laws, regulations, standards and specifications related to project construction.
If the civil air defense basement with special requirements really needs to use non-standard doors, expert certification shall be organized.
Non standard door There are no professional production drawings and testing standards for “non-standard door”, “non-standard blocking plate” and other protective equipment in the design drawings.
The civil air defense door frame shall be embedded on the side close to the shock wave.
Newly built, reconstructed and expanded single excavation and pit (ground) type civil air defense works and air defense basement built in combination with ground buildings shall be subject to the supervision of the quality supervision organization of civil air defense works.
During construction, pay attention to control the length of tie bar.
All civil air defense protective equipment (including various protective closed doors, closed doors, suspended plate valves, explosion-proof wave floor drains, overpressure exhaust valves, closed valves, oil screen dust filters, filter absorbers and equipment auxiliary pipelines, etc.) must be manufactured and installed by designated special manufacturers with qualifications recorded and approved by the provincial civil air defense office.
Therefore, in general, non-standard doors are strictly prohibited without the permission of the municipal competent civil air defense department.
The anchorage length of stressed reinforcement is 2 construction joints, and the horizontal construction joint height of side wall of ordinary basement is 300mm; The basement of civil air defense is 500mm.
▲ the main link of civil air defense engineering quality supervision is to say no to these behaviors! The supervision unit is strictly prohibited from contracting civil air defense projects outside the scope of qualification.
Explain the content of the quality supervision station of Nanjing civil air defense engineering supervision and Management Office – common problems and prevention of civil air defense engineering quality supervision.
