The layout of tie bars for slabs and walls.
5.
Especially at the boundary between civil air defense and non civil air defense, it is necessary to review whether the beam section at ordinary times affects the opening of the civil air defense doors..
6.
Civil air defense main body design 1.
Key problem 1.
The opening of civil air defense doors According to the installation requirements of the civil air defense door atlas, a certain height should be reserved between the top of the door opening of the civil air defense door and the bottom of the beam or pipe within the opening range.
The pipeline should not pass through the civil air defense enclosure structure.
People began to take the basement building as the future development goal.
The horizontal construction joint of the side wall shall be set on the wall not less than 500mm from the surface of the bottom plate.
4.
In the process of encouraging the continuous development and utilization of the basement space, we must pay more attention to the civil air defense design, especially the multi-storey civil air defense project.
For multi-layer civil air defense project, the first step of design is very important, and it is also very critical.
The thickness of the wall here is determined according to the structural form of the door, generally ≥ 500.
The setting of tie bars in 4.11.11 of Code for Design of Civil Air Defense Basements (GB50038-2005) shall comply with the following provisions: the civil air defense enclosure structure is subject to large impact load in wartime, and the setting of quincunx tie bars is conducive to shear resistance, preventing falling of fragments, and maintaining the integrity of concrete.
For the protection unit, the protective closed door is set outside the unit according to the resistance requirements of the unit.
Land is a kind of scarce resource, especially in the densely populated areas of some large cities, the scarcity of land is very obvious.
Protection unit (1) According to the use function, the protection unit is divided according to a certain area, and the protection facilities and internal equipment of each protection unit are self-contained; (2) Area of protection unit: shelter for professional team members and general staff ≤ 800m2; Equipment shelter of professional team ≤ 2000m2; Supporting works ≤ 2400m2.
Let’s sort out the main points of civil air defense design today.
(2) No joint shall be set inside the protection unit.
Relationship between the protection unit and the ground (1) The bottom layer of the civil air defense roof is generally not higher than the outdoor ground; (2) Level 6 civil air defense, when the upper part is a brick concrete structure (Shanghai Code or a frame structure with a height of no more than 18m below the 6th floor), the height can be ≤ 1.0m; (3) Level 5 civil air defense: when the upper part is a brick concrete structure (Shanghai Code or a frame structure with a height of no more than 18m below the 6th floor) and there is a soil borrowing condition, it can be higher than or equal to 0.5m and covered with soil in the face of war.
The relationship between the protection unit and the pipeline has nothing to do with the air defense basement.
2.
2.
When conditions limit the need to pass through its roof, only water, heating, air-conditioning refrigerant, etc., with a diameter of no more than 75 mm, are allowed to pass through, and protective sealing measures should be taken (pipe plugging diagram).
With the rapid development of social economy, a large number of people have entered the city, which has increased the burden on the city to a certain extent, and the land resources are also constantly shrinking.
In the actual design, the multi-storey underground civil air defense project is more complex than the single-layer civil air defense basement.
For the civil air defense basement with low floor height, special attention should be paid in the design process to avoid the obstruction of the pipe and structural beam, which will cause the civil air defense doors to not open normally.
In the current relevant policies and regulations of our country, there are further requirements for the protection of cultivated land.
4.
Net area standard and net height of first class personnel shelter 1.3m2/person, room net height ≥ 2.4m, beam bottom ≥ 2.0m; The second class personnel shelter is 1.0m2/person, the room net height is ≥ 2.4m, and the beam bottom is ≥ 2.0m; The shelter for professional team members is 3.0m2/person, the room net height is ≥ 2.4m, and the beam bottom is ≥ 2.0m; The small vehicles of the professional equipment shelter department are 25-45m2/set, and the medium-sized vehicles are 50-80m2/set.
Therefore, the above parts must be avoided during the setting of the post cast strip.
The position of the construction joint shall be set according to 6.4.16 of Code for Construction and Acceptance of Civil Air Defense Works (GB50134-2004).
As most civil air defense works are designed separately in peacetime and wartime, according to 8.6 of the Code for Construction of Concrete Structures (GB506666-2011), the height of horizontal construction joints of external walls is mostly located 300 mm from the surface of the base plate in peacetime design.
To facilitate the embedding and connection of water stop steel plates, it is recommended that the height of construction joints be designed uniformly according to wartime requirements.
The adjacent protection units shall be equipped with protective closed partitions.
Relationship between protection units (1) The building equipment of each protection unit is self-contained.
The parts with requirements for protection and sealing, such as the mouth of the project, the protective sealed section, the lighting well, the reservoir, the water sealed well, the anti-virus well, and the explosion-proof well, shall be concreted integrally at one time.
When they are connected, protective closed doors shall be set on both sides.
The civil air defense protection unit should be marked out.
3.
Reinforced concrete wall thickness ≥ 200; Brick wall thickness ≥ 370, height direction @ 500 with 3 Ф 6 Full length reinforcement.
The net height of the pipe bottom at the beam bottom is+0.20.
If the joint between adjacent protection units needs to open a connecting port, a small walkway shall be added to facilitate the setting of protective closed doors.
3.
The location of the post cast strip shall be set according to 6.4.11 of Code for Construction and Acceptance of Civil Air Defense Works (GB50134-2004).
Anti explosion unit (1) is divided into anti explosion units in the protection unit according to the use function and a certain area; (2) The area of the anti explosion unit: professional team member shelter, general staff shelter ≤ 400m2; Equipment shelter of professional team ≤ 1000m2; Supporting works ≤ 1200m2; (3) When small rooms are arranged with walls inside civil air defense, anti explosion units may not be divided; The civil air defense is located on the second floor underground and below the second floor of the multi-storey building, so the protection unit and anti explosion unit may not be divided; When the civil air defense facilities are located at or below the third underground floor of a high-rise building, protection units and anti explosion units may not be divided; (4) Anti explosion partition wall shall be set between anti explosion units, and anti explosion retaining wall shall be set at the connecting port, which can be built in the face of war.
