What is the material of the Bian River Bridge in the Song Dynasty? What material is S235?

This kind of ancient bridge, the general material is to use stones and the like, generally these stones and the like to carve, or to deal with them, because at that time, like artificial bricks, it is definitely not used, I think that if you use it, that is, to pave a layer on the surface, if you really want to complete the overall structure, you should still use stones and the like.

The Bianhe Bridge is imposing, tall enough for the largest ships in the Bianhe River basin to cross smoothly, wide and sturdy enough to drive several animal-powered carts full of goods side by side.

The bridge deck is tightened with rows of timber chains, so that it forms a huge and solid whole, and the load is dispersed to make the wood across the river evenly stressed, just imagine that more than 1000 years ago, such a large timber is horizontally erected on the river, the difficulty of the construction can be imagined, and the vastness of the project is how magnificent the mountains and rivers. There is a firm guardrail on the side of the bridge to ensure the safety of vehicles, horses and pedestrians, so that the performance and quality of the project have reached an impeccable realm.

Bianhe Bridge is the throat of both sides of the road, the bridge deck is full of traffic, due to the many pedestrians in the past, the vendors lose no time in occupying the road to operate, some set up stalls, some sell food, there is a stall that sells knives and scissors, oxtail locks and other small hardware, in order to make the goods more eye-catching, the stalls are designed to be inclined planes, such a scene, has been extended to the bridgehead, forming a characteristic business area.

At this time, on the bridge deck, a ** rode a horse across the bridge from the north end, walked to the top section of the bridge deck, and happened to meet a sedan chair from the south end of the bridge. This unexpected encounter forced one of the rider's attendants to quickly hold on to the reins, while the other hurriedly stretched out his hand to beckon pedestrians to avoid, and the big horse was in a dilemma by this "sudden braking".

Due to a momentary panic, the sedan chair drivers struggled to support themselves, but they were in a mess. At this time, there was a brief "traffic jam" on the narrow and congested bridge deck.

Another farmer who was pulling his cart down the bridge had his cart sliding rapidly due to the inertial force of the downhill slope, which forced him to hold on to the pole, bend his back, and spread his legs apart to keep the wheelbarrow balanced. The donkey had no more attention, it dragged the loose noose, twisted its head, and was careless, as if it wanted to take the opportunity to pick up a piece of grass and leaves.

The material of the Bianhe Bridge in the Song Dynasty seems to be a stone, stone bridge. The styling is good.

s235jr

It is a non-alloy structural steel of the European standard, which is equivalent to the Q235B of the national standard, that is, carbon structural steel with low carbon content, which is used for welding, bolting and riveting structures.

Plain grade surface (FA).

Pickling the surface. The surface is allowed to have slight and local deficiencies such as pitting, concave surface, scratches and other pockmarks, which do not exceed half of the thickness tolerance of the steel plate, but the minimum allowable thickness of the steel plate and steel belt should be ensured.

Higher-grade surface (FB).

Pickling the surface. The surface is allowed to have local defects that do not affect the formability, such as slight scratches, slight indentations, slight pitting, slight roller marks and color differences.

It is mainly used in buildings, bridges, ships, vehicle structural parts, manufacturing various tools, cutting tools, molds and measuring tools, etc.

It is a European standard steel grade, which can be replaced by Chinese Q235.

Carbon.

Its materials are: PVC powder, plasticizer, hard oil, heat resistant oil, stabilizer, release agent.

Vinyl is a toy material, a little soft, with good elasticity, generally used to make dolls, generally hollow, but there are also solid, the cost will be high. Since 1924, when Germany gave birth to the world's first rotocast machine and successfully produced the first toy "chocolate bunny", the unique shaping power of SLUSH is destined to bring endless new visual sensations to the world. With the popularity and popularity of a series of representative works, the vinyl has added a colorful color to the traditional entertainment industry.

1. Luminous material.

Copying Signs: Use glow-in-the-dark material signs.

2. Acrylic Acid Signage: Use acrylic material to make the sign of the main material of the board.

3. Metal DAO signage: In the absence of a special designation of the board surface, the metal is used as the main material of the board surface or text of the sign.

4. Electro-optical board: a sign that uses light-emitting diodes or luminous tubes to achieve monochrome or color performance effects.

5. Smooth signage: The picture or board surface is oily and very smooth signage.

According to the different needs, the materials used are also different, generally based on aluminum plates, and others include fiberglass, plastics and so on.

Generally, there are alloy materials: such as stainless steel, aluminum alloy, copper, polymer materials: rubber, TPU, etc.

The manufacturer has a good version:

Cangnan County Zhengquan Line Signage Factory.

Cangnan County Xinlai Signage Factory.

Cangnan County into the standard brand factory.

I won't list them all here, but you can check many good trademark manufacturers through the Internet and news reports.

With the screenshot, you can enjoy a 95% discount on Alibaba.

Tianlang logoThe general materials for the production of identification signs and light boxes are: stainless steel plate, copper plate, PVC plate, blister, acrylic, wood plate, iron plate, aluminum plate, etc.

Acrylic sheets are generally used indoors, and are not recommended outdoors because in summer, when the temperature is too high, it is easy to deform.

Aluminum plate and stainless steel plate are mainly distinguished by their strength, and most of these two plates are used outdoors, and they are corrosion-resistant.

Copper plates are generally suitable for high-end villa communities, but they are expensive!

WCB is cast carbon steel, and WCB's forging is A105. Writing on the valve indicates the body material. WCB is an American grade, which is equivalent to ZG280-520 in China.

Its chemical composition:

c≤；si≤；mn≤；p≤；s≤；Impurity element cr ; mo≤；v≤；ni≤；cu≤；Total impurities 1%.

Note: Mn can be increased with each decrease in C, but the maximum Mn cannot be higher.

WCB is generally carbon steel used on the valve body. There is a national standard WCB, and there is also an American standard WCB equivalent to domestic No. 25 or No. 35 steel.

WCB is made of cast steel.

WCB is a cast steel grade in the United States, corresponding to the domestic cast steel grade ZG230-450.

Its chemical composition:

c≤;si≤;

mn≤;p≤;s≤;

cr≤;mo≤;

v≤;ni≤;

cu≤；Total impurities 1%.

Note: Mn can be increased with each decrease, but the maximum Mn cannot be higher.

Mechanical properties: RM485-655MPa

rel≥250mpa

a≥22%z≥35%

Permeable pavement. It is paved with a kind of porous lightweight concrete (excluding fine aggregate) made of aggregate (stone), cement, reinforcing agent, and water.

This is the subgrade of cement underneath. It is topped with asphalt doped with cement and sometimes laid together with the suppression.

Add pebbles to the asphalt!