Why should the bricks at the bottom of the beam be laid diagonally Why are the bricks used for the i

I agree with the view of the "chivalrous and benevolent" on the second floor. The purpose of diagonal bricklaying is to make the filling wall and the beam more closely combined, so as to avoid the generation of cracks, in some places with strict requirements, the cement mortar at this position is also required to be filled with micro-expansion agent, the purpose is also to compensate for the subsidence and deformation of the wall, so as to avoid cracking.

1. This situation usually only occurs during the construction of the infill wall, which is a frame structure with beams first and then walls.

2. The construction of the rear masonry filling wall should be in the frame structure after it has sufficient strength before it can be masonry, and the spatial sequence of masonry should be from top to bottom (this point is not strictly implemented by most projects at present), and the construction is required to stop construction about 20cm from the bottom of the beam during masonry, and at least 7 days later, the method of oblique brick can be used to fill it. The purpose of this requirement is to make the deformation of the system stable after loading, firstly, to avoid the negative bending moment of the beam caused by the downward deflection of the frame beam, thereby changing the stress state of the frame structure beam, and causing potential safety hazards (accidents); Second, to avoid the filling wall from cracking due to the deflection of the beam.

In other words, the purpose of blocking the bottom of the beam and emphasizing the top-down construction sequence after staying for 7 days is to avoid the above two adverse consequences, and has nothing to do with the purpose of diagonal masonry later.

3. The form of oblique bricklaying does not have an advantage in the extrusion force of the beam and the filling wall caused by the downward deflection of the buffer beam, and the actual situation is just the opposite. If it is horizontal masonry, then to the bottom of the beam will always leave a horizontal gap that can not be plugged with bricks, this gap you can only stuff mortar inside, it is difficult to stuff it densely and full, and it will inevitably produce cracks in the end; If you use diagonal bricks, you can fill the top to avoid cracks. Therefore, the role of diagonal bricklaying here is not to change the stress state of the beam and prevent the wall under the beam from cracking, otherwise, you can directly lay the bricks flat, and the contact is not dense and does not just play a buffering role?

Apparently not so.

Mainly considering that the shrinkage of concrete and aerated block is not synchronized with time, oblique masonry plugging is the key, should be to increase the integrity, and the greatest possible reduction or delay of cracks, the key is to plug tight, in addition to oblique masonry, there can be other methods.

If you think about it, wouldn't it be easier to stuff it diagonally like that? Can it all be stuffed if it is flat?

The reasons are as follows: 1. Careful and diagonal bricklaying can make the infill wall and the beam tightly combined to avoid cracks;

2. It appears during the construction of the infill wall, and is a frame structure with a beam first and then a wall;

3. The construction of the masonry filling wall should be built from top to bottom when the frame strength is high, and stop about 20 centimeters from the beam, and after seven days, the method of oblique bricks should be used to fill it; The purpose is to make the deformation of the system stable after loading, firstly, to avoid the negative bending moment of the beam caused by the downward deflection of the frame beam, so as to change the stress state of the frame structure beam, and secondly, to avoid the wide cracking of the filling wall due to the deflection of the beam under the beam.

Generally, in the filling wall, the top brick oblique masonry is to make the top of the wall dry and dense plastering is not easy to crack, the effect is not good and the construction is not easy to operate, on the one hand, the oblique brick is because the suit material is the same as the filling wall material, and the problem of mixed paint will not occur, and there is that the oblique masonry can better squeeze the gap with the bottom of the beam plate, and there is also a kind that can also be poured with concrete, but it is generally not often used because it is time-consuming and laborious, and it is easy to cause shrinkage cracks.

The first floor is only one of the reasons, and another reason is that the transfer process of floor load is made up of slabs, beams, columns, foundations, and foundations.

When the load on the slab is transferred to the beam, because the beam deformation will squeeze the wall at the bottom of the beam, if the brick at the bottom of the beam is a masonry, then this part of the load will be transferred to the wall, resulting in the wall as a load-bearing structure, thus changing the load transfer of the house, making the structure change from the frame to brick concrete. And the masonry of the current frame structure mostly adopts the non-load-bearing wall design, then its strength can not meet the load requirement, and when the load exceeds the strength of the wall, the wall body can be cracked, and even destroyed.

Mainly for the topmost brick construction, if it is not oblique, the top layer of bricks is difficult to stuff in, or there may be a large joint, mortar can not be filled.

The brick is an unstable structure when placed obliquely, and once the force is applied, it will produce displacement and adjust to the position where the force is not stressed, so as to ensure that the whole wall has been kept in a non-load-bearing state! It will not affect the overall structure!

The brick load bearing is the brick load-bearing, the frame structure is the beam and column load-bearing, and the wall is only enclosure and filling.

In order to ensure that the load of the beam is transmitted to the column and not to the wall, the brick in this place needs to be able to avoid the downward deformation of the beam after being stressed, so as to avoid the beam pressing on the wall and becoming a brick wall load-bearing.

The main thing is to make the wall and the beam more tightly connected.

Due to the difficulty of construction to the top, a layer of mortar and a layer of bricks can not meet the perfect contact between the wall and the beam, so there will be a large void, when filled with mortar, it is generally difficult to bond, and it will slowly fall off after a long time, which directly affects the effect of beauty and sound insulation. When taking inclined masonry, the wall can be better in contact with the beam plate, and the void is reduced greater, and the wall can also bear the load transmitted by the beam and plate when the beam and plate are deformed, so the construction requires the choice of inclined masonry.

How long does it take for the oblique bricks at the bottom of the beam to be laid! At least how much height should be left to build the wall under the oblique bricks, after the masonry should be left for a period of time, and then the oblique bricks should be laid.

Generally forty-eight hours.

The height is generally eighteen to twenty centimeters.

This can effectively prevent future cracks between the rear masonry wall and the beam.

Summary. Hello, I am glad to answer for you: generally in the filling wall in the top brick oblique masonry is to make the top of the wall dry dense plastering is not easy to crack, flat masonry is not good effect and construction is not easy to operate, with oblique bricks on the one hand because the suit material and the filling wall material is the same, will not occur the problem of mixed paint, there is also the oblique masonry can better squeeze the gap with the bottom of the beam plate, there is also a kind of concrete can also be poured with concrete but generally not often do not need because of time-consuming and laborious easy to cause shrinkage cracks.

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Hello, I am glad to answer for you: generally in the filling wall in the top brick oblique masonry is to make the top of the wall dry dense plastering is not easy to crack, the effect of flat Hu simple masonry is not good and the construction is not easy to operate, with oblique bricks on the one hand because the suit is the same material and the filling wall material, will not occur the problem of mixed paint, there is also the oblique masonry can better squeeze the gap with the bottom of the beam plate, there is also a kind of concrete can also be poured with concrete but generally not often do not need to be done early because of time-consuming and laborious easy to cause shrinkage cracks.

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