Chapter 1781： Hollow steel drum wheel

In fact, the so-called cement board road is also very popular in later generations, and many squares have also used this kind of pavement. Of course, that is a low-end square. High-end squares are either laid with marble slabs. Or, use tiles. Only those with a small investment budget will use cement slabs to lay the pavement.

Because the strength of cement board is not high, unless it is reinforced concrete cement board. Ordinary cement board is not as strong as stone board. Moreover, the appearance is also poor. After all, what does the cement look like? Everyone knows that it is gray, and it looks like it is not of grade.

Therefore, many pedestrian street squares lay tiles directly on the pavement, which looks very dazzling. But to be honest, the ceramic tiles are so thin that they are not as strong as cement boards. Encountered heavy trucks, surely finished. Only the pedestrian plaza will lay this thing.

The appearance of cement board is much worse than ceramic tile. But the practicality is stronger. At least, bear the carriage, whatever, even if it is a carriage.

In addition, it is convenient to repair and replace the road surface paved with cement board. Which cement board is crushed, pry it up and replace it with a new one ...

Because it is too convenient when paving roads, Marin has now abandoned the original plan to promote cement roads and instead promoted cement board roads. Especially the streets in the city, the laying of cement slabs is quick and convenient, and the effect is also very good. At least, not worse than the previous stone road and cobblestone road.

But the most important point is that Marin can sell cement board to other countries!

Before, Marin had been unwilling to help other countries build cement roads. Because of the special nature of cement, when it is used and mixed, it will definitely arouse strong interest in other countries, and it is easy to attract thieves.

But selling cement slabs is different. Cement slab Marin can lie that it is a kind of inferior slate. The price can be a bit lower than the authentic slate, and even half the price is very profitable.

That is to say, from now on, Beihai will have a new exportable product-pavement cement board!

This kind of square cement slab, which is almost as thick as a brick but has a side length of 24 cm, is very convenient for paving. As long as the roadbed is tamped and the road surface is leveled, the wet clay (as a binder) can be directly laid on the roadbed.

This is much simpler than getting a cement road. A construction worker can lay dozens of cement slabs in a moment, and a long road can be laid in a day. As long as the clay mud used as a binder is dry, the road surface can be put to use.

As for the roadbed, the roadbed mixed with lime and sand, which was popular in the European Roman Empire, was used. This kind of roadbed water is not bad, and both Eastern and Western civilizations like to use it.

Of course, the domestic cement board road in Beihai is definitely different from the foreign cement board road. The difference is in the adhesive ...

Generally, clay mud is definitely used as the binder between cement boards. Usually there is no problem, but if the water soaks during the rainy season, the mud will definitely soften, resulting in some loosening of the road surface. As time goes on, there will be some problems with the pavement, which needs to be repaired.

And the cement slab roads laid in Beihai, then use cement directly as a binder. Cement and cement slab bricks are the same substance, and after drying, they are not afraid of water. In this way, the quality of Beihai's local cement slab road that uses cement as a binder for cement slab bricks must be better than that of foreign countries.

But then again, even if mud is used as a binder abroad, the road surface quality is definitely much better than dirt road and stone road. Therefore, in the future, cement slabs will certainly not worry about sales.

But first of all, Marin must make a model to show everyone the benefits. Only in this way will customers come to order cement bricks.

In this way, helping the Netherlands lay cement roads in towns that do not depend on the sea and the river has become a top priority.

It is just right. The engineering unit formed by Marin is currently idle because there is no war. Therefore, Marin intends to send engineering troops to the Netherlands to help build cement slab roads, which will serve as a demonstration.

Of course, it is already early September, and the autumn harvest is coming soon. Marin plans to send engineering troops after the fall harvest to go to the Netherlands to help lay cement roads.

At present, the total number of Beihai State Engineering Corps has reached a huge scale of 5,000. Their main task is to build bridges and build roads for the army. Of course, there are also important tasks responsible for building military fortresses.

Every one of them has basically received the training of masons craftsmanship, also the training of bridge erecting craftsmanship, and also knows how to build bunkers. The laying of concrete slab roads is a very low-end job for the engineering soldiers. It is very simple and does not cause any problems.

Moreover, in order to facilitate their work, Marin also helped them to "design" (plagiarize) out working protective gloves and iron hard hats (there is no high-strength plastic). In addition, there is a tilting tipping trolley for easy dumping of bricks. This trolley with tipping bucket can dump lime and sediment, which is of great help to the construction of the project. Unlike ordinary cars (including unicycles), it is inconvenient to dump and can only be unloaded manually, which is cumbersome and laborious.

Uh ...

In addition to these common construction equipment in later generations, Marin has also innovated in the roadbed compaction and rolling ...

Everyone in the future knows that when building roads, a road roller is needed to laminate the roadbed. In order to achieve the purpose of compacting the road surface, the wheels of the roller are often steel rollers weighing several tons or even more than ten tons.

However, in this era, it was difficult to make such heavy wheels. It's not that it can't be made, it's made, it can't be pulled. After all, even the strongest Sharma can pull up to 5 tons of cargo. Moreover, the result of the application of low resistance bearings.

If you don't use ball bearings to reduce resistance, it is estimated that Sharma can pull two or three tons of cargo.

Similarly, if you want to pull a heavy roller for rollers, it is difficult for general animals to handle it. To achieve this, Marin used a method of pulling several cows together.

But the biggest problem is not that the horse can pull multiple rollers, but the transportation of heavy rollers!

If it is a few hundred pounds of stone dimple, the transportation is simple, just a few people can be carried on the carriage. This is the case with the current artillery in Europe. A three-pound gun weighs 300 pounds and can be easily carried on a carriage and transported over long distances.

However, the rollers used for roller compaction weigh at least two tons, or even several tons. Otherwise, the effect of tamping the roadbed cannot be achieved.

But the problem is that a few tons of rollers are actually easy to build, but it is difficult to transport to the construction site ...

If it is a construction area near the sea and river, it can also use a boat to move pulleys and levers to transport a few tons of rollers to the construction area. But if it is in the inland area ... it will be difficult to transport in, especially in the mountainous area, it can't be transported ...

In these years, there is no heavy construction machinery, and it would be fatal to want to transport a few tons of rollers to areas with inconvenient traffic. Therefore, even the largest caliber infantry artillery made by the North Sea State generally has a maximum gross weight of one or two tons. This is still under the premise that Beihai has a caged ball bearing. If other countries, a ton of infantry artillery is difficult to transport ~ www.novelhall.com ~ What should I do? A few tons of gravity simply cannot meet the requirements of tamping the roadbed ...

Finally, Marin found inspiration when Robert the bear boy kicked a glass bottle filled with half a bottle of water ...

Yeah, empty bottles are not heavy, but they become much heavier when filled with water. If you use hollow steel barrels ...

So, Marin designed a huge hollow steel barrel. The steel drum itself is less than one ton, but after being filled with water, the total weight reaches as much as 5 tons. It's absolutely enough to use it for pressure!

When transporting the rollers, as long as the hollow steel drums drain the water, they become empty drums weighing less than one ton. Coupled with ball bearings that use caged balls, it is very convenient to walk with a horse. Or, by setting a springboard slope, you can roll the hollow steel barrel onto the specially made wide-body carriage, which is very convenient.

Then, the road construction industry in Beihai has been greatly developed. With this hollow steel drum roller, Beihai can easily transport this roller to all parts of the country, quickly and easily reach the construction site, lay the roadbed, and build a more durable road. Even building roads in the mountains is fine. Anyway, as long as it is not filled with water, although this hollow steel barrel is not light, it can still be loaded into a horse-drawn carriage into the mountains. After all, something with a total weight not exceeding 1 ton is completely within the carriage carrying capacity. It's really not possible, you can change two or three horses to pull the cart together, and you can always transport the roller to the construction area ...

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