The door frame wall reinforcement of the threshold civil air defense door shall be constructed according to the civil air defense structural drawing, and the elevation of the anti beam at the lower part of the door frame wall shall be controlled within a reasonable range, Not missing, too high or too low; The cross-sectional width of the reinforcement of the civil air defense door opening shall be ≥ 10mm greater than the clearance width of the civil air defense door opening, so as to meet the embedded installation of the transverse angle steel locking box of the civil air defense door frame
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The floor drain pipe must be embedded before the bottom plate is poured with concrete
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The cable well is generally located outside the outer wall or on the roof of the air defense basement (on the upper floor)
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5、 The air defense basement is a peacetime and wartime project with many plugging openings
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Precautions for pipeline routing: the civil air defense roof and surrounding enclosure structure (1) and the pipeline irrelevant to the air defense basement (not used in combat and peacetime) shall not pass through the wall, plate and other enclosure structures as far as possible, and the three main pipes (sewage pipe, rainwater pipe and gas pipe) of the superstructure shall not enter the air defense basement; If the pipeline must pass through the roof of air defense basement, free wall and door frame wall, its nominal diameter shall not be greater than 150mm; Protection and sealing treatment shall be done well; In the process of embedding in normal construction, it is necessary to consider the pipeline direction of telecommunications, monitoring and other equipment in the later stage, reserve the embedded pipeline for its later use, and it is strictly prohibited to drill in the later stage
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The steel plates shall be flat and the wing height shall be 30 ~ 50mm
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In case of any contradiction between the location of the sump and the foundation, it can be moved nearby, and the pipeline at this place can be moved accordingly
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In order to ensure the rapid opening of the trench in the later stage, the sealing method of the trench after acceptance shall be cement slag or steel cover plate, and it is strictly prohibited to fill it with concrete
The installation of civil air defense threshold reinforcement the anti beam reinforcement of the bottom plate of the door frame wall of the civil air defense door shall be constructed according to the civil air defense drawing, the height of the anti beam reinforcement of the lower threshold shall be bound according to the structural detail of the civil air defense door frame wall, no omission is allowed, and a reasonable protective layer shall be reserved for the civil air defense door
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A
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It has professional requirements for explosion-proof, gas-proof and radiation protection, and has high requirements for construction quality
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The water supply and drainage pipeline passing through the civil air defense roof and side wall shall adopt steel plastic composite pipe or hot-dip galvanized steel pipe, and PVC pipe shall not be used; Precautions in air defense basement construction (I) the drawings of one or two design institutes of architecture discipline shall be used together
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During the pre embedded construction, each discipline shall have a clear division of labor, and the equipment installation shall be closely combined with the civil construction to ensure no omission
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General requirements: 1
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Please clean according to the plan and the plugging table (peacetime and wartime conversion table) and do not omit it
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If the construction is not accurate, the civil air defense door can not be closed tightly and can not meet the acceptance standard
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The joint between the sealing wing ring and the short pipe shall be fully welded on both sides
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Do not omit to set the bracket in the well, and there is no need to bury the blocking frame on the bracket
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In principle, the civil part shall be subject to the civil court drawings, and the civil air defense part shall be subject to the civil air defense drawings
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It is not allowed to dig holes after pouring concrete, which will affect the tightness of air defense basement, affect the protection quality of air defense basement and fail to meet the requirements of acceptance specifications
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We should digest and understand the drawings and relevant node details of the standard drawings selected in the design in advance, so as to know well before construction
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2
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If there are unclear places or contradictions in the two design drawings, we should pay attention to timely communicate and contact with the design institute to avoid rework due to errors and omissions
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8、 The civil air defense must be informed of the change of civil drawings in time for review（ 2） Structural discipline I
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Precautions for embedded casing: all embedded pipes passing through the civil air defense wall shall use steel pipes and galvanized pipes with wall thickness greater than 2.5mm, and must be equipped with closed wing rings
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B
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The closed wing rings shall be made of steel plates with thickness greater than 3mm
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Therefore, we hope to pay enough attention to the construction
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During installation, the axis of the short pipe passing through the wall shall be perpendicular to the wall, and the length of both ends extending out of the wall should be about 50 ~ 100mm（ For details, refer to the specifications of various disciplines) when the diameter of the circular opening of the embedded pipe in the civil air defense wall is greater than 150mm and less than 1000mm, the opening shall be equipped with reinforcing bars with a diameter of 12-16mm and a length of 1000mm; If the hole diameter is greater than 1000mm, the method of binding the hole with reinforcement shall be adopted for construction, and the four corners shall be locally strengthened after embedding
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Be careful not to omit it
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The embedded parts, reserved openings and embedded steel frames of civil air defense plugging openings shall be carefully cleaned to avoid mistakes and omissions
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In addition to doing a good job in the main construction of air defense basement, the mouth of civil air defense is the key and difficult point of construction
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2、 Before construction, be familiar with the drawings and digest the drawings
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The position, size and direction of embedded components and reserved openings shall be accurate
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The reinforcement of structural foundation (including pile foundation, independent foundation, raft, water resistant plate, etc.) and vertical components (frame column and superstructure shear wall) shall be designed by the civil design institute, and the structural bottom plate shall meet the relevant requirements of civil air defense; The civil air defense wall and the special stairs and ramps at the main entrances and exits of civil air defense are designed by our institute; The beam and slab reinforcement drawing is designed by our institute, and the formwork relationship (axis positioning, plate elevation change, etc.) is designed and provided by the Civil Institute; During construction, the civil drawings and civil air defense drawings shall be combined for construction
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6、 The civil air shaft in the civil defense area shall be blocked horizontally in case of War (see the blocking table or peacetime and wartime conversion table for details)
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Airtightness requirements of civil air defense engineering: after the construction of civil air defense basement structure, it is strictly prohibited to open holes or cause structural damage on civil air defense floor, wall and roof; All equipment installation shall not reduce the effective structural thickness of civil air defense components such as civil air defense wall and roof.
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A floor drain or cleanout should be reserved at the location of the pool and discharged to the nearby water collecting well
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Design scope: the civil air defense area mainly includes three parts: bottom plate, wall and top plate
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The sump in the anti-virus channel at port 1 cannot be moved out of the anti-virus channel; The sump outside the protective enclosure of 1 and 2 entrances cannot be moved to the civil air defense area
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Civil air defense project is an independent unit project, which is divided into eight sub items: architecture, structure, ventilation and air conditioning, water supply and drainage, electrical, fire protection, decoration and orifice protection
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During construction, pay attention to meeting the requirements of drawings of two design institutes at the same time
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Design basis: the engineering drawings are designed in accordance with the civil air defense law of the people’s Republic of China, code for design of civil air defense basement and other current relevant national codes and regulations and relevant local policies and regulations
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Do not omit it and keep it until the completion acceptance
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Air defense basement is different from ordinary basement
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3
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For example, the door frame at the mouth of civil air defense has technical index requirements such as flatness and verticality
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The post cast strip is not allowed to pass through the civil air defense gate and temporary blocking, nor through the civil air defense function room and mouth
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In case of any contradiction between the Civil Institute drawings and our institute drawings, the design institutes of both parties shall be notified in time for coordination and settlement
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If it is necessary to pass through the closed section of civil air defense due to foundation bearing platform and other reasons, contact the design institute and ask the design institute to issue a change
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3、 During construction, civil engineering and equipment shall be closely coordinated
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Precautions for formwork erection: it is strictly forbidden to use PVC casing to cross the wall, repeatedly use screw construction and place concrete prefabricated parts
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There are gutters at peacetime openings with a width greater than 3m
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7、 Where an explosion-proof wave cable well is designed, it shall not be omitted
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4、 The civil air defense sump (including shared sump) is respectively set in the anti-virus channel at entrance 1, outside the protective closed door and outside the protective closed door of the closed channel at entrance 2
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Construction stage of structural bottom plate: (1) explosion proof floor drain shall be set at the mouth of civil air defense (diffusion chamber, decontamination room and closed channel), which shall be connected to the poison collecting well at the mouth through drainage pipe, and the galvanized pipe shall be embedded in the structural bottom plate; In wartime, the men’s and women’s dry toilets and water rooms can only be provided with ordinary floor drains, which are connected to the internal sewage collection well through the drainage pipe, and cannot be connected to the non protected area
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During construction, you can’t only look at the drawings of one design institute, but must compare the drawings of the two design institutes and use them together
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The construction deployment of post cast strip civil air defense project mouth, protective closed section, daylighting well, pool, water seal well, anti-virus well, explosion-proof well and other parts with protective sealing requirements shall be poured with concrete at one time
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Because of its protective sealing performance requirements and construction irreversibility, the embedded parts of civil air defense door and wall through embedded equipment of relevant disciplines must be constructed in place at one time, and late drilling is not allowed
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