How to do fire prevention between building floors for 2 hours?

The completed wall (100mm thick wall) of the new environmentally friendly metal mesh inner partition wall produced by Chongqing Qianding Metal Materials ****, the fire resistance limit exceeds 2 and a half hours (more than 150 minutes), and the professional data of the National Fire Building Materials Quality Supervision and Inspection Center (Dujiangyan) testing.

Chongqing Qianding Metal Materials - the pioneer of energy conservation and environmental protection of building partition wall materials, located in the southwest region of Chongqing, the geographical advantage of the city, for the majority of construction units, real estate development enterprises ** new environmental protection hollow inner mold metal mesh partition wall materials. Loncin Group.

The hollow inner membrane metal mesh cement inner partition wall is a new type of lightweight wall with metal mesh as the inner membrane and cement mortar on the outside. The hollow inner membrane metal mesh cement inner partition wall not only has the advantages of traditional brick wall durability, but also improves the characteristics of poor sound insulation of other new partition wall building materials that cannot be hung and decorated, and its unique anti-cracking performance solves the common problem of easy cracking of the partition wall materials currently used.

Its advantages are as follows:

1. The section is small, and the actual room yield is high

2. Good sound insulation, energy saving, strength and moisture-proof effect.

3. Great benefits, low investment and high returns.

4. The construction period is fast, and the comprehensive cost is easy to control.

5. Labor saving, reduce the waste of nest labor.

6. Product acceptance guarantee 7. Good seismic performance.

Isn't the reinforced concrete floor sufficient?

1. Gypsum board is a flame-retardant B1 grade product, and there is also a text in the national standard "Code for Fire Protection Design of Building Interiors": the gypsum board installed on the light steel keel can be used as Class A.

Second, for the national fire code for the wall, and other components of the fire resistance limit requirements, it is not simply said that gypsum board can meet a certain fire resistance limit requirements, this is a systematic concept. In the national standard GB "gypsum board", it is clearly stipulated that the stability of refractory gypsum board in case of fire should be greater than 20 minutes.

Among them, the stability of Dragon brand refractory gypsum board can reach more than 40 minutes when exposed to fire.

3. The gypsum board system is composed of gypsum board, light steel keel and various auxiliary materials. The type of gypsum board used, the quality of gypsum board, the number of layers of gypsum board, the quality and installation method of the keel, whether to fill rock wool and the bulk density of rock wool, the way of joint treatment, and the treatment of some detailed nodes will greatly affect the fire performance of the system.

The lightweight partition wall composed of gypsum board and light steel keel is mainly used to divide the general partition of the building space, according to the design requirements, the middle can be filled with rock wool, and different series of gypsum board and light steel keel are used, and the wall can have different fire resistance and sound insulation performance. There are two construction methods for the Beixin Dragon gypsum board firewall:

Dragon gypsum board fire-resistant partition wall: the fire limit is up to 4 hours, which is suitable for the firewall and public safety passage partition wall of various public buildings, and meets the first-class fire protection standard.

Fireproof and pressure-resistant partition wall: refers to the partition wall that can withstand the instantaneous gas impact of more than 1200pa, and is mostly used in the partition wall of the room where there is an inert gas fire extinguishing demand, such as the equipment room. The fireproof and pressure-resistant partition wall of Beijing New Building Materials can withstand up to 4800pa, which is especially suitable for high-rise fire prevention.

The fire resistance limit of the column of the second-class fire-resistant single-storey factory building (warehouse) should not be lower.

For the non-load-bearing exterior wall of a Class II fire-resistant building, the fire resistance limit should not be lower than that when a non-combustible wall is used; When using flame-retardant walls, it should not be less than. The fire resistance limit of the non-load-bearing exterior wall of the above-ground factory building of Class D and E fire resistance grades is not limited when the non-combustible wall is used. The fire resistance limit of the room partition wall in the second-class fire-resistant factory building (warehouse) should be increased when the flame retardant wall is used.

The fire resistance limit of prestressed reinforced concrete floor slabs in multi-storey factories and multi-storey warehouses of the secondary fire resistance grade should not be lower.

According to the provisions of the "Code for Fire Protection Design of High-rise Civil Buildings", when the fire protection level is Class I, the fire resistance time requirements of the components are: column: 3 hours, beam: 2 hours, and floor:

Hour; When the fire rating is level II, the fire resistance time requirements of the component are columns: hours, beams: hours, and floors

1 hour. For fire-retardant coatings, the fire-resistant time of general thin fire-retardant coatings does not exceed hours, and thick fire-retardant coatings should be used for more than hours.

The fireproof of steel components can be used in several ways: outer concrete (or masonry brick method), fireproof coating, fireproof board covering and composite structure, fireproof board can be divided into fireproof thickness board and thin plate, fireproof thickness plate thickness is 20 50mm, mainly calcium silicate fireproof board and expanded borth fireboard, the main varieties are KB board, CF board; The thickness of the fireproof sheet is between 6 15mm, and the main varieties are staple fiber reinforced cement pressure board, fiber reinforced ordinary calcium silicate board and glass cloth reinforced inorganic board.

As we all know, the steel structure usually loses its bearing capacity at a temperature of 450 650, and a great deformation occurs, resulting in the bending of steel columns and steel beams, and the result can not continue to be used due to excessive deformation, and the fire resistance limit of the steel structure that is generally not protected is about 15 minutes.

Therefore, when the fire rating of the steel structure is level II, the fire resistance time requirements of the components are: column: hour, beam: hour, floor:

1 hour. The steel structure can be covered with concrete (or masonry brick method), fireproof coating, fireproof board cladding and composite structure to achieve the required fire resistance limit time.

Regardless of whether it is a steel structure or a concrete structure, when the fire rating is level II, the fire resistance time of the components is the same. Requirements for high-rise buildings: columns: hours, beams: hours.

The steel structure generally does not meet this requirement, which is the biggest disadvantage of the steel structure, such as the 911 World Trade Center, the plane did not directly knock down, it was the fire that burned the columns and truss beams before collapsing so quickly, so the steel structure must be fireproof.

Generally, it is made of galvanized iron sheet, and it is fixed to put fireproof rock wool to achieve the effect of fire prevention.

The fire spacing is based on the Code for Fire Protection Design of Buildings GB 50016-2014, and the fire spacing between high-rise and multi-storey buildings should comply with the following provisions.

The fire spacing between buildings shall not be less than the provisions of the table, and the fire spacing between other buildings shall comply with the relevant provisions of other chapters of this code in addition to the provisions of this section.

Other buildings in the table refer to multi-storey and single-storey buildings other than high-rise buildings.

You misunderstood. The relationship between the fire resistance grade, fire resistance limit, and fire resistance time is different.

China's civil buildings can be divided into the first class and the second class of buildings according to their building height, use function and floor area, and the fire resistance level is still determined according to the determination of the building height, use function, importance and fire fighting difficultyFire resistance ratingIt can be divided into:

Class I, II, III and IV, the fire resistance grade classification is to facilitate the determination of other fire protection requirements of the building according to the fire performance of the building itself. According to this classification and the fire resistance of the corresponding building components, it can also be used to determine the fire resistance level of the existing building, and the combustion performance of the corresponding components of the building fire resistance grade is determined byNon-flammable, flammable, flammableThree of these componentsFire Resistance LimitFrom 3h, 2h, 1h, etc. This is what we commonly call the refractory time.

The fire resistance of the whole building is the basis to ensure that the building structure will not be damaged in the event of fire, and the combustion performance and fire resistance limit of a single building structural component are the basis for determining the overall fire resistance of the building.

Therefore, the fire resistance time of the building and the fire resistance level of the fire-fighting equipment are not the working hours of the water pump. I don't know if I understand.

Fire performance of glass curtain wall:

1. Inter-layer fire protection design of frame glass curtain wall:

When the main structure of the building has a window sill wall, the horizontal smoke band of the glass curtain wall should be located between the upper end of the window sill wall and the curtain wall structure.

When the main structure of the building does not have a window sill wall, the horizontal smoke barrier of the glass curtain wall should be located between the upper end of the structural beam and the curtain wall structure. And on the outer edge of the floor slab, a non-combustible solid skirt wall with a fire resistance limit of not less than 1 hour and a height of not less than is not lower.

In both cases, the horizontal smoke strip is placed at the upper end of the main structure adjacent to the curtain wall. When a one-story building catches fire, it will inevitably lead to the destruction of all curtain wall glass on the same floor. Considering the flame effect, a glass will also be damaged if it is infiltrated in the adjacent area, so the water and water pei Li Ping smoke proof belt is set at the upper end of the structure to ensure that harmful gases will not escape into the upper floor of the building in a short time.

If the horizontal smoke strip is set at the lower end of the main structure, as shown in Figure 3, the two glasses A and B will be destroyed in a short time when the building is caught in flames. Harmful gases will penetrate into the upper floor of the building through the gap between the curtain wall and the main structure. Although such a design superficially meets the fire protection regulations of the curtain wall, it does not meet the fire protection requirements of the building.

For the main structure of the building without window sill wall, the non-combustible solid skirt wall with a fire resistance limit of not less than 1 hour and a height of not less than 1 hour is set on the outer edge of the floor slab is for the consideration of the flame effect. Because the interstory structure of ordinary buildings is about less than the flame radius of ordinary civil buildings in case of fire (. This distance behind the increased non-combustible solid skirt is approximately greater than the flame radius.

If not set the non-burning solid skirt wall,. When the building is caught in flames, the two pieces of glass, A and B, will be destroyed in a short time. Harmful gases will escape from the broken area of the B glass into the upper floor of the building.

Second, the interlayer fire protection design of the unitized glass curtain wall:

Due to the installation requirements of unitized glass curtain wall, the main structure of the building using unitized glass curtain wall generally does not have window sill wall. Interlayer fire prevention should be in Figure 2.

3. Point glass curtain wall and inter-layer fire prevention

The glass of the point curtain wall is mostly made of tempered white glass, and the glass transmittance is high; The supporting members are more complex. It is not easy to set up a horizontal smoke belt, and even if a horizontal smoke belt is installed, it will greatly damage the external visual effect of the curtain wall. Therefore, it is not advisable to use point-type glass curtain walls that span fire zones.

The Code for Fire Protection Design of Buildings stipulates that the distance between the nearest edges of two adjacent evacuation doors in the same room should not be less than 5m. At present, according to the understanding of the Fire Bureau, regardless of the distance between the two safety exits of each fire partition or the distance between the evacuation doors of each room that requires more than two evacuation doors, whether it is a residential or public building, it is required to be 5m.

It is for public buildings and non-residential buildings.

First of all, the distance between the nearest edges of two adjacent evacuation doors should not be less than 5m, and the provision is not a bar, but 5

Version 5 2 "The security exits and evacuation doors in the building shall be dispersed, and the horizontal distance between the nearest edges of each adjacent safety exit of each fire partition or one fire partition in the building shall not be less than 5 m. ”

Secondly, the Code for Fire Protection Design of High-rise Civil Buildings is the code before the implementation of the Code for Fire Protection Design of Buildings (2014), which can be said to replace the Code for Fire Protection Design of High-rise Civil Buildings after the Code for Fire Protection Design of High-rise Civil Buildings came out. However, there are some details in the Code for Fire Protection Design of Buildings, which are not indicated, and you can refer to the content of the Code for Fire Protection Design of High-rise Civil Buildings.

The currently implemented copy version of the code is the Code for Fire Protection Design of Buildings GB50016-2014.

5 5 2 stipulates that the safety exits and evacuation doors in the building shall be arranged in a dispersed manner, and the horizontal distance between the two adjacent safety exits on each floor of each residential unit or one fire partition in the building, and the nearest edge of the two adjacent evacuation doors in each room shall not be less than 5m.