What does it mean that the cast iron cellar manhole cover load level 10 means

The upstairs is very professional!

One more point. Generally, municipal engineering will require manhole covers to be sent for inspection, and the testing standards are single-point bearing capacity of 360kn and 210kn

Level 10 stands for the 210kn standard.

There are also standards such as A15, B125, C250, D400, etc.

Wuhan Yuanfang manhole cover hopes to help you!

For manhole cover standard questions:

The 97S501-1 atlas recommended by the Ministry of Construction is an atlas used in engineering design. It is designed with reference to CJ T3012-93.

Design load classes: -20 and -10. Usually what we call 700 light ductile iron manhole cover has an inner diameter of 700, and the diameter of the manhole cover is 740.

However, in the design description of the first edition of "Municipal Drainage Pipeline Engineering and Ancillary Facilities" Atlas No. 06MS201 in February 2007 (i.e., the revised version of 97S501-1), the design load was changed to: heavy: into - class A light:

Grade-B (citing the General Code for the Design of Highway Bridges and Culverts JTG-D60-2004 and the Design Load Standard for Urban Bridges).

In more detail, the so-called heavy duty now refers to the factory inspection that allows the pressure of 360kN or super-steam -20 class main car; Light refers to the main vehicle that is allowed to bear 210kN or steam-10 class.

There should be data in this inspection report.

This distinguishes between light and heavy rather than diameter.

Light; Steam-10 class main car (total weight of the car 10 tons, rear wheel pressure tons).

Henan Yuxing metal products ****.

Although there are many types of manhole covers, ductile iron manhole covers are widely used. This also reflects everyone's recognition of the function of ductile iron manhole covers. In order to meet the needs of different uses, ductile iron manhole covers are also divided into many grades, and different grades are not under pressure.

Let's take a look at the classification criteria for ductile iron manhole covers.

Green spaces, walkways, bicycle lanes, or sidewalks that are prohibited from light motorized vehicles, roads or parking spaces for vehicles of ordinary class and below, or roads or parking spaces for heavy vehicles, used to cover the road or deep wells in the home to prevent pedestrians or objects from falling. Generally, it is divided into round ductile iron manhole covers and square ductile manhole covers.

In urban road management, it is generally circular, because the circular manhole cover is not easy to tilt, which can better protect the safety of pedestrians and vehicles. The use of a circle is mainly based on the fact that the diameter and length of each circular manhole cover through its center are the same, so that if the manhole cover is rolled up by a passing vehicle, then no matter how it is rolled up, its diameter will be slightly wider than the wellhead below, and the manhole cover will not fall into the wellhead.

Ductile iron manhole covers are divided into six grades according to their bearing capacity.

Level 1: (A15 type is selected for the lower level): green belts, sidewalks and other areas where motor vehicles are prohibited from entering.

Level 2: (B125 type is selected at the lower level): sidewalks, non-motorized vehicles, car parking lots and underground parking lots.

Level 3: (C250 type is selected at the lower level): residential areas, back streets and alleys, areas where only light motor vehicles or cars drive, and within curbs on both sides of the road.

Level 4: (D400 type is selected at the lower level): urban trunk roads, highways, highways and other areas.

Level 5: (E600 type is selected at the lower level): cargo terminals, docks, airports and other areas.

The load of the truck (main car) is allowed to be 20 tons, that is, the allowable load is below.

In addition, this manhole cover belongs to the heavy-duty (highway) manhole cover.

What are you talking about, really, I don't understand what you're saying.

The manhole cover load capacity refers to the pressure test carried out by a pressure testing machine within the unit area, usually weighing 40 tons. In the case of a passing vehicle, the calculation formula for a 5-axle heavy-duty truck is: 5 axles x 40 tons = 200 tons.

With a gross weight of 200t tonnage, this heavy-duty manhole cover can be guaranteed to pass.

And some manufacturers have said that the technical parameters of 80 tons of vehicles, if divided by 5 axles, then it is the manhole cover load of the factory: 80t 5 = 16t, which shows that the load of the manhole cover itself is only 16 tons.

It is generally divided into round and square. In the aspect of road administration in the urban area, the circular shape is generally adopted, because the circular manhole cover is not easy to tilt, can better protect the safety of pedestrians and vehicles.

For machining 60-degree quenched steel, it is recommended to use CBN inserts.

Victor tools KBN100 cubic boron nitride composite sheet (PCBN) for machining hardened steel. Its hardness is 8000 9000HV, heat resistance is 1400 1500, and its flexural strength BB after hard composite is 1500MPa, which is most suitable for semi-finishing cracking and finishing of quenched bent steel.

Hardened steels can be machined with tungsten carbide, ceramic and PCBN tool materials, and the VIRBAC tool KBN100 is better than carbide and ceramic tools.

When cutting quenched steel, it is necessary to reasonably select the geometric parameters of the tool, the amount of cutting and master the precautions in operation according to the specific conditions.

The use of PCBN cutter to cut quenched steel can realize the grinding by turning instead of grinding, and improve the processing efficiency.

Inspection manhole covers are divided into two grades of heavy and light according to their different bearing capacity (see Table 1).

Table 1 Grading Signs Set Occasions.

Heavy Heavy (z) Roads and sites where motor vehicles are driven and parked.

Light light (q) Green spaces outside the above ranges, roads and sites where motor vehicles are prohibited from passing and parking.

Indicates different grades. Cast Iron Manhole Cover.

The bearing capacity (36 t) of the heavy-duty manhole cover is basically reasonable, which is close to that of the D400 manhole cover (40 t) of EN124. For example, a Class A manhole cover with a crack load of 180 kN is equivalent to a B125 manhole cover in the EN124 standard and a light manhole cover in CJ T3012.

Commonly used ductile iron manhole cover grade mark setting occasions:

Category 1: (minimum A15 type): green belts, sidewalks and other areas that prohibit flexible vehicles from entering.

Category 2: (minimum B125 type): sidewalks, non-motorized vehicles, car parking lots and underground parking lots.

Category 3: (minimum C250 type): residential areas, back streets, cold alleys, areas where only light motor vehicles or cars drive, passing through the curbs on both sides.

Category 4: (minimum D400 type): urban backbone roads, highways, highways and other areas.

Manhole cover is generally divided into round and square, in the road administration of the urban area, generally adopt circular, because the round manhole cover is not easy to tilt, can better protect the safety of pedestrians and vehicles.

D400: represents a manhole cover with a load of about 36 tons C250: a manhole cover with a load of about 25 tons ABCD This refers to the load-bearing level, and the Chaocai manhole cover is a genus of composite materials.

Grades: A15, B125, C250, D400, E600, F900, Light, Heavy, Light, Normal, Normal, Normal, Normal, HeavyExtended MaterialsRelevant standards: EN 124 "Drainage ditch covers and inspection manhole covers for driveway walkways", CJ T 3012-93 "Cast iron inspection manhole covers", CJ T 121-2000 "Recycled resin composite inspection manhole covers", JC 889-2001 "Steel fiber reinforced concrete inspection manhole covers", CJ T 212-2005 "Polymer matrix composite grate".

Among them, the European standard EN124 is internationally applicable, approved by the CEN (Technical Committee on Drainage Installations) on June 6, 1994, and is applicable to manhole covers of various materials, which stipulates that in any case This standard is the undisputed international standard.

d400: It represents the inheritance.

to weigh about 36 tons.

Self-manhole cover C250: BAI manhole cover with a load capacity of about 25 tons.

ABCD here DU refers to the load-bearing grade DAO, and the Chaocai manhole cover is the grade of composite materials: A15, B125, C250, D400, E600, F900, light, heavy, light, light, ordinary, heavy, heavy,

D400: Represents a manhole cover with a load capacity of about 40 tons.

Manhole covers, which are used to cover roads or deep wells in homes to prevent people or objects from falling. According to the material, it can be divided into metal manhole cover, high-strength fiber cement concrete manhole cover, resin manhole cover, etc. Benefits:

1. High strength: magnesite inspection, with high compressive, bending and impact strength, and toughness. After long-term use, the product will not be crushed and damaged by the manhole cover, which can prevent the occurrence of "urban black hole" accidents.

2. Beautiful appearance: magnesite inspection manhole cover surface pattern design is exquisite, the color is bright, and the urban environment is beautified. 3. Easy to use and light in weight

The weight of the product is only about one-third of that of cast iron, which is easy to transport, install and repair, and greatly reduces the labor intensity. 4. Anti-theft: magnesite inspection manhole cover has no value, natural anti-theft; According to the needs of customers, it is equipped with a locking structure to realize the anti-theft of property in the well. ...

Referring to the industry standard "Cast Iron Inspection Manhole Cover" (CJ T3012-93) (this table is quoted from the National Architectural Design and Research Institute 97S501-1 Atlas), it is the national standard design and manufacturing model (97S501-1 Atlas), material & load grade weight (kg).