The next day, the main points of beam erection continued-☆→,

Maybe it's because Zhang Tianhu criticized Wei Jian by name at last night's weekly meeting, Wei Jian came to the Yunzhuang construction site very early, not even eight o'clock.

When Shu Cheng and Zhang Xiaoyun came to the construction site, Wei Jian was already waiting at the construction site, and it was eight o'clock in five minutes!

Shu Cheng thought that he was dazzled, and after careful identification, he was sure that it was Wei Jian, and he suddenly wondered in his heart, which one is this Manager Wei doing today?

Subsequently, Wei Jian took Zhang Xiaoyun and asked Lao Yan, the boss of the construction team, to convene a morning meeting with migrant workers, and at the same time clarify the division of labor.

Originally, these things were all done by Lao Yan, but now it is Wei Jian who has arranged it, obviously not wanting to mess up the main point again!

Shu Cheng did not go to the morning meeting with the migrant workers, he came to the southwest side of the crossing to check the filling of the roadbed.

After last night's efforts, the southwest side of the crossing was filled up to three-quarters, if nothing else, God also gives face, tonight and then work overtime, you can fill this area, fill in, in this way, the chief engineer on the Yunzhuang roadbed filling construction, half of the completion of the construction.

From the point of view of appearance, the quality of the shoulder filling is still good, there is no big problem, as for K30 and the like, although Shucheng did not do it, but according to his construction experience, it should not be a problem, of course, if you must find the worst place to do, there may be unqualified places.

Wei Jian's morning meeting lasted about thirty minutes before it ended, and after the arrangements were made, Wei Jian got on the train and headed to the station.

Before the main point, the leaders of the railway unit and the construction and supervision station have to hold a meeting, and after the meeting, the points will be given.

At 9:30, the station was punctual to give a point, and according to Wei Jian's instructions, the migrant workers performed their duties, and some of them proceeded.

The rest of the work is the hanging beam, which was supposed to be constructed yesterday, but due to a sudden accident, the construction was delayed to this point today.

Under the lifting of the 200t crane, the two pieces of beam are slowly erected on the piled sleeper, and then the distance between the left and right is controlled, because the length of the steel sleeper is certain, and at the same time, in order to ensure the safety of driving, the distance from the center of the line to the beam on both sides should be equal.

It took about half an hour to hang the two pieces of beams, and then the migrant workers began to put on the corbels to connect the beams with the steel pillows that were inserted yesterday.

Now that it is proceeding in an orderly manner, Shu Cheng is also relaxed, because there is nothing else to do now.

The next thing he has to do is to lay out the line and set the control point.

In the construction of frame culvert jacking, it is extremely important to control the middle line not to deviate and not to warp and plant.

This is also the focus of the top construction control!

How to control the middle line is not biased, so that the frame culvert jacking process, and the mileage of the original design coincide, the technical control is very important.

For this, Shucheng's method is three points and one line, Shucheng will set up the total station on the flat pad, and then look at the two backsight points set on the rail before the back, and establish the station.

Subsequently, Shucheng set a point at the center of the rail of the frame culvert, the center of the front and rear of the frame culvert and the center of the frame culvert extending 20 meters to the back, and these four points were on the same line.

When setting up the control point on the back, Shucheng specially set it up close to the back, and after setting up the instrument, you can just see the concrete on the upper part of the bottom.

When the jacking construction, Shucheng only needs to erect the instrument on the point behind the back beam, and then see whether the frame culvert and the point on the rail are in the same straight line, if it is in a straight line, it means that the frame culvert has not been offset, if it is not in a straight line, it means that the frame culvert has been offset.

Shu Cheng can tell the relevant person in charge of the jacking according to the direction of the frame culvert offset, and ask him to control the strength of the jackaxe and correct the offset part.

But this kind of observation needs a prerequisite, that is, it can go to the top plate of the frame culvert, because in the jacking process, the ladder erected on the frame culvert is to be dismantled, so there must be such a prerequisite with this method.

Therefore, when Shucheng sets up these four points, a point is added at the bottom plate of the frame culvert, close to the position of the distribution beam, and the instrument is still added to the control point on the back, before the top plate can not be on, you can first look at the point reserved on the bottom plate, and then observe whether the point on the rail is on the same straight line.

Of course, there are other ways to control zhì, and most of the principles are three-point and one-line methods to ensure that the middle line is not biased.

In fact, for the flat reform of Shangyunzhuang, the middle line is not the focus of control, and the focus of control is not to warp and plant.

As for the midline deviation, the difference of twenty centimeters is not a big problem, as long as the orthogonal top is not oblique, and it is too obvious, it is no problem.

Therefore, the control of the elevation of the frame culvert is very important, because when excavating the foundation pit, it is already known that the sand layer is under the action of gravity, and the sand layer is easy to produce the phenomenon of planting the head under the action of gravity.

It's equivalent to when you top a box, the front head is stuck in the dirt, and the back head is directly cocked, and when the box is too heavy, it can't be corrected at all.

For the control of elevation, Shucheng only set four points on the four corners of the frame culvert, and recorded the initial height difference of these four points with a level, and observed the change of the height difference of the four points with the jacking, and made appropriate adjustments.

On this day, Shucheng has been busy with this matter with the cooperation of Liang Shengjian, and tomorrow will install the top pickaxe, and then try the top, once the top test is successful, the day after tomorrow will start the jacking construction, so this matter must be carried out in advance.

The so-called test top, is to install the jack pick, try to jack, once the frame culvert is moved, it means that the top test is successful.

Because at the moment of jacking the frame culvert, the force that needs to be jacked is the greatest.

When installing the jackaxe, the earthwork in front of the frame culvert on the side of the line also began to be excavated, after all, the earthwork in front of it was not excavated, and it could not be jacked.

But when the soil layer is dug to the elevation, it is all fine sand.

"Minister Shu, what do you think of this situation?" Zhang Xiaoyun looked at Shu Cheng and asked, now, Zhang Xiaoyun has put Shu Cheng in the same position and does not despise Shu Cheng.

Obviously, if this situation is topped up, there will be no doubt about it!

"This kind of geology must not be jacked, or report to the leader and pour concrete." Shu Cheng couldn't help it, he thought about it.

In places with poor geology, it is feasible to use the method of pouring concrete, like extending the sliding bed slab.

"And the concrete is poured under the line?" Zhang Xiaoyun frowned.

The line is poured concrete, and the delay period will definitely be longer, and once it rains, there is a great risk!

"Call the leader first, discuss the method, as for the geology under the line, wait until after the excavation, it's really not good, all the concrete is poured below!" Shucheng Road.

Subsequently, Zhang Xiaoyun directly dialed Zhang Tianhu's phone, this kind of thing, it is better for the person in charge of the site to report to the project manager, and if Shucheng wants to report, it is also reported to Sun Xun and Gong Xinliang, the chief engineer of the project.

But sometimes, Sun Xun and Gong Xinliang pay attention to Zhang Tianhu and nod their heads, so it is better to call Zhang Tianhu directly.

Zhang Xiaoyun explained the situation at the scene, and after Zhang Tianhu understood the situation, he said that he would pay attention to it later, and he happened to be nearby.

In less than 20 minutes, Zhang Tianhu came to the scene, and after watching the scene, he said to Zhang Xiaoyun: "Xiaoyun, pour 30 centimeters of concrete directly, as for the soil quality under the line, after excavation, according to the specific situation, if it is still fine sand, then pour concrete, if it is soil, then according to the specific situation." ”

"Okay, Manager Zhang, I will arrange to pour the concrete in the afternoon, which will not affect tomorrow's jacking construction!" Zhang Xiaoyun nodded in response.

It's still early, and the mixing plant was notified at 0:00 that the concrete pouring was to be completed, and there was still time to do so.

"Team Zhang, after pouring today, the strength of the concrete may not meet the requirements tomorrow!" Shu Cheng pondered for a moment and said what he thought.

After all, less than twenty-four hours have passed, and the strength of the concrete cannot even reach half of the strength, and Shu Cheng is worried that if something happens in the jacking process, the gains will outweigh the losses.

"This issue also has to be considered, but I think that the concrete is supported by force, not tensile and should not be a big problem." Zhang Tianhu did not ignore Shu Cheng's words and said so.

Hearing Zhang Tianhu's words, Shu Cheng also nodded slightly, indeed, as Zhang Tianhu said, the poured concrete is only used as a support to enhance the bearing capacity of the foundation, as long as it is not crushed, there is no big problem.

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