What is the level of 40m waterproofing and what is the waterproof grade of concrete?

Generally, the waterproof standards of watches are divided into: 30 meters, 50 meters, 100 meters, 300 meters, and 500 meters. The depth of water resistance does not refer to the depth in the water, but the pressure.

3ATM: 30-meter water resistance, waterproof for general life, water droplets splashed when washing hands, and raindrops falling when it rains lightly. However, care should not be taken for too long, let alone in the sauna;

5atm: 50-meter water resistance, enhanced lifestyle. Can be wiped with a small amount of cold water;

10atm: 100-meter water resistance, you can wear a watch for car washing and showering activities, but you can't soak in water;

30atm: 300-meter water resistance, suitable for swimming activities, but only suitable for light swimming. Do not interpret this as being in 300 meters deep water;

50atm: 500-meter water resistance, can be used for diving sports. At a depth of one or two hundred meters, it is not recommended to dive deeper.

In fact, these three are the same, GB50164-92 in the marking symbol is "S", GB50164-2011 changed to "P" S6 is inaccurate, belongs to the old standard of the statement, P6, W6 are from the "Underground Engineering Defense and Land Cave Water Technical Specifications" and "Hydraulic Concrete Test Regulations", P6 (W6) = 10H-1.

Impermeability class (P, previously denoted by the letter S, with the same meaning): indicates the impermeability grade of concrete.

Impermeable concrete: refers to concrete with impermeable grade equal to or greater than P4. Impermeable concrete is divided into 6 grades according to different impermeable pressures: P4, P6, P8, P10, P12 and greater than P12.

Impermeable concrete improves the pore structure by increasing the compactness of concrete, thereby reducing the permeability channel and improving the impermeability.

The anti-pickpocketing water rating is level 4.

The protection level (dust and water resistance) of industrial products is: "IP64". Namely:

Dustproof Buwang is level 6: dust sealing: dust should not enter the cabinet at a low pressure of 20 mbar; The waterproof rating is 4:

Prevent the instrusion of splashed water, and prevent the intrusion of splashed water from all directions.

IP is the code used by the international to determine the protection level IP rating consists of two numbers, the first number means dustproof; The second number indicates water resistance, and the higher the number, the better the level of protection.

The level of waterproof protection function of the anti-ruler draft water grade, including the waterproof grade of the building, the waterproof and dustproof grade of the instrument, is mainly determined according to the nature, importance, functional requirements of the building, the characteristics of the building structure and the durability of the waterproof layer.

The following situations are comprehensively considered when dividing the waterproof level: the imitation cavity will cause huge losses after leakage, up to the personal **; Leakage can cause significant economic losses; After leakage, it will cause general economic losses; After leakage, it will affect the appearance.

The waterproof grade of the building should be determined by the designer in the waterproof design, according to the nature of the building, the degree of importance, the use of functional requirements, etc., to determine the waterproof grade of each part of the building, and then according to the waterproof grade, the waterproof layer durability to select waterproof materials.

Waterproof grade: The level of waterproof protection function, including building waterproof grade, instrument waterproof and dustproof grade. It is mainly determined according to the nature of the building, its importance, the functional requirements for use, the characteristics of the building structure and the durability of the waterproof layer.

The following situations are taken into account when dividing the waterproof level: leakage will cause huge losses, up to the human body**; Leakage can cause significant economic losses; After leakage, it will cause general economic losses; After leakage, it will affect the appearance.

The waterproof level IP of the international industrial standard and the JIS waterproof level of the Japanese industrial standard are similar, divided into 9 levels from 0 to 8, and the IP level also stipulates the dustproof.

IPX-0 has no waterproof protection.

The IPX-1 device, in normal operation, can provide waterproof protection equivalent to 3 5 mm minutes of rain for 10 minutes.

The IPX-2 rating is basically the same as the IPX 1, but it can pass the water resistance test with a 15-degree upturn in all directions.

The IPX-360 degree angle splash protection provides water protection at a flow rate of 10 liters per second for 2 to 5 minutes and a pressure of 80 100 nm.

The IPX-4 rating is basically the same as the IPX 3, but it provides all-round and angular splash protection.

The IPX-5 is waterproof in all directions and angles, providing waterproof protection at a flow rate of 2 to 3 minutes and a pressure of 30 Nm.

IPX-6 waterproof protection for large waves, can last for 2-3 minutes to resist a depth of 3 meters under water, a flow rate of 100 liters minutes, and a pressure of 100 nm.

IPX-7 can be soaked for 30 minutes at 1 meter underwater.

The IPX-8 is thoroughly waterproof and can be used continuously in water for a long time.

How is the waterproof grade defined? What is the true waterproof rating.

The first type of building is a particularly important building, the waterproof durability is 25 years, the second class of buildings is an important building, the waterproof durability is 15 years, the third type of building is an ordinary industrial and civil building, the waterproof durability of 10 years, the fourth type of building is mostly three or five years to be demolished or the waterproof requirements are very low buildings. Waterproof and durable life: 5 years.

How is the waterproof grade defined? What is the true waterproof rating.

Now the norms have changed. There are only two levels. Level 1 is an important or high-rise building with two waterproof layers. Level 2 is a general building with a waterproof layer.

Class I buildings are particularly important buildings, and the waterproof durability life is 25 Class II buildings are important buildings, and the waterproof durability life is 15

The three types of buildings are ordinary industrial and civil buildings, and the waterproof durability is 10 The four types of buildings are mostly buildings that need to be demolished in three or five years or have very low requirements for waterproofing. Waterproof durability 5 Yuxiang waterproof provides.

How does the waterproof level define the state bridge? What is the true waterproof and sensitive occlusion and other bridge closure level.