The layman looks at the excitement, and the insider looks at the doorway, this is not false at all!

People who have never done construction work look at the buildings rising from the ground and the railways leading to the east, west, north and south, and feel that it is nothing more than that. ∷Top∷Point∷Small∷ said,

The hardships can only be experienced by those who have experienced it firsthand.

Because any detail has the potential to lead to the rework of the project.

At this moment, it is already twelve o'clock in the middle of the night, and Shucheng is still leveling the site planning map.

The planning drawing is not difficult for Shucheng, it can even be said to be very simple, what makes Shucheng have a headache is the change of the drawings, this kind of thing to make his own design, Shucheng has never encountered it in his previous life, this is the first time.

Since the rebirth, there are really no technical problems that have stumped Shu Cheng, this is the first time, of course, it is not a problem, it can only be said that there are some minor troubles.

With Shu Cheng's own efforts, the trajectory of his life has begun to change slowly, and since he became the vice minister, Shu Cheng's fate has changed.

Less than one o'clock in the morning, Shu Cheng finalized the last word of the temporary plan for the re-establishment of Shangyun Zhuangping, and the first draft was completed, and then the plan was directly sent to the QQ of the chief engineer Sun Xun, so that Sun Xun could take the time to revise it.

I didn't expect Sun Xun to be a night owl, and he hadn't slept yet, this didn't come out of Shucheng's accident, Sun Xun was out of Ming's desperate San Lang, and he didn't want to die overtime!

After the two chatted a few words, Shu Cheng began to look at the 1-8 meter flat reform drawings sent by Sun Xun to himself.

The only drawback is that this drawing is only 10 meters long, and Sun Xun also told Shucheng that the length of Shangyunzhuang was changed to 25.8 meters, and this length was calculated. The sum of the spacing of the four strands is 15 meters, and the distance from the station line to the shoulder on both sides is 4 meters, which adds up to 23 meters. For the remaining 2.8 meters, 1.4 meters of cable trough is left on one side, so the length is set at 25.8 meters.

The reinforcement of the main body of the frame culvert, the calculation is not complicated, directly use the steel bar on the 10-meter drawing, multiply by the length of 10 meters, wait for the amount of steel bar required for the length of one meter, and finally multiply by 25.8 meters, which is the amount of steel bar required by the main body of the frame culvert.

Of course, the problem is not here, but in the sliding bed and distribution beams.

The so-called sliding bed board is the time when the main body of the prefabricated frame culvert is poured, the concrete below the frame culvert is poured, the paraffin wax is poured on this layer of concrete, the plastic film is covered and a layer of cement mortar is poured, the frame culvert body is poured on the cement mortar, and the role of paraffin is to play a lubricating role, and when jacking, reduce friction.

As a simple example, if you push a solid box forward on a flat tile, the tile is equivalent to a sliding bedboard, and between the box and the tile, in order to reduce friction, we can pour lubricant to reduce the friction between the box and the tile.

The same is true at the construction site, the sliding bed board is just poured out of cement, instead of the tile, and the lubricant on the tile is replaced by paraffin wax in the project, and the box is the frame culvert on the project.

Now here's the problem, our usual situation, you push the box forward on the tile, and the tile won't move. If the tile is placed on the floor, as the weight on the tile increases, and you push the box forward, plus the lubricant operation, is it possible that the box does not move, but the tile goes backwards?

At the construction site, because the friction between the sliding bed plate and the soil layer or sand layer below is not enough, the frame culvert jacking has no movement, but the sliding bed board retreats, which does occur.

If you want to avoid this, what can be done?

The most direct way is to increase the weight of the tile to increase the friction between the tile and the floor.

In the project, it is to pour a thicker sliding bed board, and at the same time set up a few more anchor beams, and the depth increases.

What is the anchor beam, for example, when buying a house, when you first buy a house, most of them have only one door, and the interior has to be decorated by yourself, at this time, you can see the beams.

And the concrete floor slabs you see are like the surface of the sliding bed, and these beams are poured under the sliding bed, one at intervals of three to five meters, and between the anchor beams, there is raw soil to increase friction.

Today, the thickness of the sliding bed board on the drawing is 20 cm, and the anchor beam is also 20 cm thick and 20 cm wide, every four meters.

Obviously, this design is completely sufficient for a 10-meter-long frame culvert, but now it has been changed to 25.8 meters, which is not very secure.

After thinking about it carefully, Shucheng did not change the thickness of the sliding bed board, but changed the anchor beam to a width of 50cm, and set one every 5 meters, a total of five.

After drawing the diagram of the sliding bedboard, Shu Cheng continued to look at the distribution beam.

Or push the box on the tile, if the person pushing the box changes to a top pick. The distribution beam is equivalent to a wall, and the root of the wall is connected to the tile.

The box is placed at an interval from the wall, in the middle, we put the top pick, one end against the wall, the other end on the box, when the top pick starts to work, as the force increases, the support force against the wall, the box is pushed forward.

Therefore, the distribution beam is equivalent to this wall.

Once the box is heavy enough and the wall is too thin, it is very likely that the box will not move, and the wall will die and break.

Because the wall is too thin to withstand the forces exerted during jacking by the pickaxe.

So the thickness of the wall is critical at this time.

The thickness of the 10-meter-long frame culvert distribution beam is only 80cm, two meters high, and it is extremely dangerous to jack the 25.8-meter frame culvert, so Shucheng directly changed the distribution beam to 2 meters thick, and the height remains the same.

At this time, some people may ask, since the wall is too thin, it is completely possible to put things behind the wall, so that the wall does not die, isn't it the same to ensure safety?

Indeed, in construction, behind the distribution beam, there are supported things, which are generally slurry stone backs, just to prevent the distribution beam from being jacked up.

However, even if there is a slurry sheet stone back, or steel sheet pile protection, if the distribution beam is too thin, it is easy to break at the junction of the distribution beam and the sliding bed slab as the weight of the frame culvert increases.

It's like when a box is topped, there is a heavy object behind the wall, enough to keep the distribution beam from flying, but if the wall is too thin, the connection between the wall and the tile can easily break.

Therefore, the thickness of the distribution beam is also extremely important!

Of course, it is equally important to distribute the back of the slurry stone behind the beam. The other place, which I just mentioned, is the junction of the wall and the tile, where they are connected, this place is not treated well, and it is easy to break.

When it comes to the project, it is the place where the sliding bed board and the distribution beam are connected, and this place is not handled well, and it is likely that the entire construction project will fall short.

Shu Cheng didn't think too much about this, and directly added a 5.5-meter-long, double-head rebar with a 180-degree hook and a diameter of 22mm every 1 meter on the basis of the existing connecting steel bars of the sliding bed board and the distribution beam.

One end of the rebar is hung on the reinforcement mesh behind the distribution beam, and the other end extends into the sliding bed board for 3.5 meters, a distance that has reached under the frame culvert, which is also for safety.

After drawing the general frame diagram, it was already 3:20 in the morning, Shu Cheng turned off the computer, and then lay down to rest.