In construction projects, building materials have always been the main source of profits.

In daily life, many people may have heard construction practitioners say this: when doing projects, it is difficult to make money only by relying on labor costs, and even in many cases, labor costs often produce losses.

It must be admitted that this is a true sentence, which can also reflect the current situation of the domestic construction industry. Why is this happening? You just have to remember this ratio: three or seven open.

Because in the domestic construction cost, the material cost almost always accounts for the majority, and always accounts for the largest proportion of the project cost. In fact, it is needless to say that just such a feature can know how important building materials are to a project. The business activities of a project, from cost accounting to planned profit sources, building materials are always the focus of construction personnel's thinking, and even many cats in the construction industry are around building materials most of the time.

For example, everyone often says "cutting corners", to be honest, in real life, there are really not many cases of "cutting corners", and the really powerful and serious is "cutting corners".

Why is there so little "cutting corners"? There are two main reasons for this:

First of all, it is actually difficult to do this kind of thing in actual construction.

For example, a project needs 5 processes, and you can save one process? If you really dare to do this, not to mention that the relevant departments will come back to you soon, even the people who eat melons can easily understand it.

The second point is that "cutting corners" actually doesn't generate much profit, just a few labor costs, and you can't make much money no matter how you steal.

The profit is not high, but it also has a strong risk, so in the construction industry, really experienced construction personnel never disdain to do such a thing as "cutting corners".

When encountering peers who really dare to do this, Li Huayong can only give a three-word evaluation:

Silly and bold.

If "cutting corners" fails, most people have to hit the idea of "cutting materials". "Reducing materials" is a good thing, not only profitable, but also quite hidden. That's why it's the way it works in the construction industry. This kind of thing is not only loved by private individuals, but also by enterprises, not only by private enterprises, but also by state-owned enterprises.

The only difference between this: some of the "material reduction" is very low-grade, and there is no technical content at all, and the "material reduction" is like "cutting corners". And some of the "material reduction" technical content is very high, with a very strong concealment and professionalism, this level of "material reduction" can sometimes even really do "unknowing".

What Li Huayong did on this project is the second level of "material reduction", which is even higher than this level and belongs to the highest level of "material reduction". Because his "material reduction" on this project has no impact on the quality of the project. Even if others knew that he had saved so much cement and knocked so many squares of concrete, he would not be blamed in any way.

So how did these 1,000 square meters of concrete be saved? This is a technical term: filling coefficient. This is a unique professional term in pile foundation construction, and Li Huayong relied on this to cut out more than 1,000 square meters of concrete in this project.

When it comes to the "filling factor", many people may not understand it. But if you mention "loss", mention the "loss" of building materials in the construction process, this may be well understood.

As a simple example, let's take the most common type of rebar used on construction sites. Let's say we build a house, and this house theoretically needs 1,000 tons of steel bar. So when the construction unit purchases steel, is it enough for him to purchase only 1,000 tons?

As everyone can imagine, this is clearly not enough. Because the steel that leaves the steel mill is obviously different from the steel bars used on your construction site. You need to cut it during construction, and you need to process the steel bars into various shapes. In this way, a lot of "leftovers" will be generated.

Those "leftovers" that can no longer be used are of course regarded as "wear and tear" of building materials.

In the construction industry, what is the approximate proportion of this type of steel? The general rule is about 2% to 3%.

Don't underestimate this ratio, a ton of steel is thousands of dollars, such as those big projects in later generations, the movement is thousands of tons of steel, if you can reduce the loss of a point, the profit is very considerable.

After talking about loss, let's go back to the "filling factor". By this time, everyone may have an understanding of this concept.

"Filling coefficient" is also a kind of "loss", which specifically refers to the loss in concrete construction.

It must be pointed out here that in ordinary civil construction, there is no such thing as "loss" in concrete, because the concrete must be poured in the formwork, and there is a formwork separation, so what should be done, and the amount of actual pouring you should be the same as the theoretical amount.

This is different from the case of rebar. In construction, there is no way to produce leftovers when cutting steel bars, and this situation should be taken into account when making a budget. And what about concrete? If you say that concrete also has any "loss", Party A will not admit it at all.

The above is about ordinary civil construction, but pile foundation engineering is different. In pile foundation construction, concrete is prone to loss. Because there is no formwork in the pile foundation project, when pouring concrete, the concrete is easy to squeeze and penetrate the soil on the edge, resulting in the actual pouring of concrete, which is far more than the theoretical amount in most of the time.

This is the loss of concrete in pile foundation engineering, which is where the term "filling coefficient" comes from.

Lei Jianjun and Xia Minghuan, why did they have complicated expressions when they heard Li Huayong mention material saving?

This is because they used to do ordinary civil engineering, and they have little experience in pile foundation construction, and the entire project department ignores the "filling coefficient" in the early stage.

Others can ignore it, but Li Huayong didn't ignore it, and even before the start of construction, he had been thinking about it. For his "first pot of gold", Li Huayong has long made great hopes on this.

In order to calculate how much money he can make, Li Huayong carefully looked through the design drawings before starting construction. What needs to be mentioned here is that Lei Jianjun and others cannot be completely blamed for ignoring this problem, because at present, domestic design institutes rarely adopt the concept of "filling coefficient", and their "design engineering quantity" is often "theoretical engineering quantity".

Not to mention the current era, even in the future, the design institute will not ignore it anymore, but the construction company itself either ignores it directly, or discounts this piece when bidding.

But this project was designed by the Japanese, but Li Huayong is a traverser. What's more, the project was preceded by a design change from mechanical drilling to manual drilling, which made it possible for Li Huayong to make a profit.

What is the "filling factor" given by the Japanese? 8%!

In other words, if the "theoretical square" is 20,000 square meters, the "actual square quantity" given by the Japanese is 21,600 square meters.

The filling coefficient of 8% is neither high nor low, because this thing is related to geological conditions, and it is possible to encounter good geology, less than 5%, but if you encounter the common "karst" landform in China, more than 10% is normal. Therefore, this data given by the Japanese can only be said to be decent.

But with such a data, it is enough for Li Huayong.

Due to previous design changes, a large part of this project was changed from mechanical drilling to manual digging. As we all know, the artificial digging pile needs to construct the "wall retainer", and when pouring concrete, what role can the "wall retaining" play? That can of course play the role of "template" and can block the concrete from penetrating outward.

Also because of the manual digging pile, the mechanical drilling workload of the lower part is reduced, the speed is accelerated, and once the speed is accelerated, all kinds of collapses, the phenomenon of collapse is also reduced.

All of this has virtually reduced the "filling factor", and although there is still a loss, this number has been reduced to a very small percentage. For example, Zhang Yongping said that "saving more than 1,000 square meters" actually came from this.

Now that things are very clear, in Lei Jianjun's office, Li Huayong believes that with the level of these people in the room, they will soon be able to figure out the joints.

Li Huayong smiled and looked at the giants of the project department in front of him, although his expression was calm, he was a little uneasy in his heart.

"Will the project department give itself the material money saved?"