How to prevent tilting and earthquake in the construction of high rise residential foundations

What the landlord saw was the composite foundation reinforcement treatment scheme, and the technical specification for building foundation treatment JGJ79-2002 introduced this practice.

The code for the design of building foundations GB50007-2002 stipulates that the stability of high-rise residential buildings that are often subjected to horizontal loads, as well as buildings built on or near slopes, should be checked. It is stipulated that the embedding depth of raft and box foundations of high-rise buildings must meet the requirements of deformation and stability.

The landlord is worried that the possible section of the debris flow belongs to the mountainous foundation, and the sixth chapter of the foundation specification has provisions on the design of the mountainous foundation, and the debris flow belongs to the engineering geological conditions of the building site, and it is not suitable to be selected as the construction site. The force of the mudslide on the house cannot be calculated at all, if you consider it, then the civil construction price of the building is greatly increased, and the house you buy is not this price.

The horizontal force of the house is not only transmitted to the cement rod through the vertical steel bar, as the landlord understands, and the horizontal force transmission path is transmitted from the foundation to the soil.

1. It depends on the structure. At present, common residential structures are brick-concrete structures and reinforced concrete structures.

2. It is to look at the seismic resistance. Internationally, the first magnitude adopts the Richter scale index, which is divided into grades, with no damage to the building on a scale of 1-3, a slight damage to the building on a level 4, and a minimum damage to the building over 5. Therefore, the ** area above level 5 should be considered for earthquake protection in the design of residences.

The advantages of brick-concrete structure are low cost, good thermal insulation and thermal insulation performance, and easy construction. The disadvantage is that the opening and entry of the house are deeply restricted, the indoor pattern can not be changed in general, the wall structure occupies too much space, and the integrity and durability are poor.

The reinforced concrete structure is suitable for medium and high-rise residential buildings, among which the high-rise residential buildings are preferably full cast-in-place shear wall structures, and multi-storey or small high-rise and high-rise residential buildings are commonly used in frame structures, large mold structures, large slab structures, etc.

In general, the reinforced concrete structure has good seismic performance, strong integrity, good fire performance and durability, and the interior surface is more flexible than the brick-concrete structure. However, the construction difficulty of this structure is relatively large, and the structural cost is relatively high.

The maximum lateral and longitudinal displacement acceleration of the local ** is calculated, and then the seismic calculation of the structure is carried out. If the general structure cannot absorb the displacement acceleration, it is necessary to consider additional seismic measures. Add seismic structural beams or seismic devices.

<> high-rise buildings occupy a very important position in urban construction, with the increasing tension of urban land, the floor height of the building continues to increase with the town of Suijia, people's attention to the stability and safety of high-rise buildings has also increased, and the solidity and reliability of the building has become a key factor for people to measure the quality of the building. In the construction of high-rise buildings, it is necessary to adopt foundation seismic isolation construction technology.

The seismic structure used in the traditional building is to use the structure and components to bring the energy consumption, and the construction design should regard the force generated by the first as an additional load, but it must be combined with other loads on the structure for design and verification to see if it can meet the standards required by the construction code.

For example, the rubber seismic isolation bearing can not only provide vertical bearing capacity and elastic positioning capacity like the building, but also have excellent deformation capacity; Another kind of seismic isolation bearing made of lead core rubber can also reduce the energy consumption generated.

In high-rise buildings, the use of grass-roots seismic isolation technology can reduce the action of the superstructure to about 3 to 6 times, and the superstructure of the high-rise building usually has more first mode shapes when it occurs. For example, the translational movement of the dry rigid body will not react much, and the large displacement of the isolation layer will reduce the load on the superstructure.

According to the requirements of the construction code, after taking certain foundation isolation measures, the superstructure will be less affected, and the components themselves and the internal equipment will not be damaged or lose their normal function, in addition to the indoor and outdoor life and staff will not be harmed, and they will not be affected by strong shaking. Even in the event of a strong earthquake, the safety of people's lives and property is well guaranteed, which not only saves the trouble of evacuating people, but also saves the cost of repairing the house, and ensures the safety of the entire building as a whole.

When applying foundation seismic isolation construction technology to high-rise buildings, the following three points need to be noted:

1.Effectively extend the seismic isolation effect of the building. After the foundation seismic isolation construction measures are applied to high-rise construction workers, the seismic isolation effect of the building will be extended, that is, the basic vibration cycle of the building will increase.

2.The overturning effect causes the isolation components to be affected by tensile forces. The construction personnel must fully consider the role of tensile force when designing the seismic isolation components, so the tensile force must be tested in advance when improving the seismic construction specifications of construction projects.

3.small** and the effects of the wind. When designing the seismic isolation layer, the construction personnel must fully consider the role of the first force, because some small ** or wind force will also affect the function of the isolation component.

All in all, from the current cases of construction and design of super high-rise seismic isolation housing buildings in China, there are still deficiencies in many aspects, which requires relevant personnel to continuously strengthen the research work of seismic isolation building construction technology, so as to improve the construction efficiency and construction quality of housing construction.