What should be the next step in the construction of the raft foundation

Earthwork excavation--- foundation treatment --- cushion.

Waterproof--- waterproof protective layer--- raft rebar --- raft formwork--- raft concrete (backfillable) - basement columns, shear walls.

Reinforcement --- basement beam roof formwork ---basement column shear wall formwork--- basement beam roof reinforcement ---basement column shear wall beam roof concrete--- one layer of column shear wall reinforcement--- one layer of beam roof formwork--- one layer of column shear wall formwork--- one layer of beam roof reinforcement--- one layer of column shear wall beam roof concrete (basement exterior wall waterproofing and backfill) - and so on.

Raft foundation, also known as slab foundation, full hall foundation. It is to connect all the independent foundations or strip foundations under the column with contact beams, and then pour the bottom plate as a whole. It is composed of a base plate, beams, etc. as a whole.

The building load is larger, the bearing capacity of the foundation is weak, the concrete bottom plate is often used, the building load is beared, the raft foundation is formed, its integrity is good, and the uneven settlement of the foundation can be well resisted. Raft foundations.

It is divided into flat raft base and beam plate raft base, and the flat raft base supports local thickened raft type; The beam-plate raft base supports two forms: upper flat and lower flat rib beam. Generally speaking, when the bearing capacity of the foundation is uneven or the foundation is weak, a raft type foundation is used. Flat raft foundation due to the simplicity of construction in high-rise buildings.

has been widely used.

Excavation, foundation treatment, cushion waterproofing, rebar, formwork, concrete, basement wall column rebar.

The next step is concrete wall reinforcement, formwork, roof beam plate formwork, steel bar, and pouring concrete.

Raft foundation construction process:Surveying, pay-off and foundation pit earthwork excavation Pouring hot layer concrete Binding hole reinforcement Supporting formwork Hidden inspection Pouring raft foundation concrete curing on raft concrete

Construction points: 1. Foundation excavation, if there is groundwater, the groundwater level should be artificially lowered to the bottom of the foundation pit below 50cm, and earthwork excavation and basic structure construction should be carried out in the absence of water.

2. When the beam is on the bottom plate, the formwork is supported by a composite steel formwork, which is supported on the rigid support frame and fixed with a steel pipe scaffold, and the beam plate is used to pour concrete at the same time to ensure integrity.

3. The foundation is poured. The surface should be covered and sprinkled with water, and not less than 7d, if necessary, thermal insulation and maintenance measures should be taken, and to prevent soaking the foundation.

Raft foundation application range.

The type of foundation used in the building is closely related to the type of foundation soil and the distribution of soil layer. In engineering design, such geological conditions are often encountered, and the rock and soil layer under the basement floor is a weathered residual soil layer, a fully weathered rock layer, a strong weathered rock layer or a medium weathered soft rock layer, so it is possible to use a natural foundation.

The basement of high-rise buildings is usually used as an underground parking garage, and too many interior walls are not allowed on the building, thus limiting the use of box-shaped foundations; The raft foundation can not only give full play to the bearing capacity of the foundation, adjust the uneven settlement, but also meet the space use requirements of the parking garage, so it becomes a more ideal foundation type.

The main structural types of raft foundation are flat raft foundation and beam plate raft foundation, and flat raft foundation is widely used in high-rise buildings due to its simple construction.

If there is a waterproof layer, the sequence is as follows: foundation cushion - waterproof layer - waterproof layer protective layer - foundation reinforcement binding - foundation formwork support - foundation concrete pouring - concrete curing - continue the basement retaining wall construction. If there is no waterproof layer, the cushion construction can be used to bind the steel bar.

It should be the first excavation of the foundation pit, if the need for precipitation to lower the groundwater in place, the foundation inspection groove is qualified in the construction of cushion and foundation.

The general raft foundation has a waterproof layer, and the sequence is as follows: foundation cushion - waterproof layer - waterproof layer protective layer - raft foundation reinforcement binding - foundation formwork support - foundation concrete pouring - concrete curing - continue the basement retaining wall construction.

If the foundation raft around the test template is a brick fetal membrane: the order is changed to: foundation cushion - masonry raft foundation around the brick fetal membrane - brick fetal membrane plastering - waterproof layer - waterproof layer protective layer - raft foundation reinforcement binding - foundation formwork support (guide wall and collection well formwork) - foundation concrete pouring - concrete curing - continue the basement retaining wall construction.

If there is no waterproof layer, omit: waterproof layer - waterproof layer protective layer 2 processes.

The raft foundation is to say that the bottom plate and the beam are built, and the foundation construction of the raft slab, after the concrete pouring is completed, it has been sprinkled and cured, and the maintenance period can not be less than two weeks。The raft foundation belongs to a kind of extended foundation, which mainly exists in some high-rise frame structures or shear wall structures.

Precautions. If the load capacity of the building itself is relatively large, and the bearing capacity of the foundation is relatively weak, the foundation of the raft plate needs to be adopted, so that the integrity can be formed, and the problem of uneven settlement on the ground can be well resisted.

To put it bluntly, the raft foundation is actually a concrete slab. It seems that the raft floats on the surface of the soil layer, so it is vividly called the raft foundation, and it is also a form of foundation in the building structure, which is closely related to the distribution of the soil layer, and some will use the natural foundation as the basic structure.

Summary. Hello, glad to answer for you. Raft foundation construction:

1. Personnel preparation: Due to the large amount of concrete pouring, it takes about 50 hours to pour, so the concrete pouring personnel are divided into three groups, each group is equipped with no less than 40 construction personnel, and each group of management personnel is not less than 4 people.

Hello, glad to answer for you. Raft foundation construction: 1. Personnel preparation:

Because the amount of concrete pouring is larger, it takes about 50 hours to pour the banquet, so the concrete pouring personnel are divided into three groups, each group is equipped with construction personnel to do Xiangdong not less than 40 people, and each group of management personnel is not less than 4 people.

Hello, glad to answer for you. 2. Material preparation: The concrete is made of C40P10 waterproof concrete, which requires a mix ratio notice and a slump of 180mm 20mm; There are no less than 20 groups of concrete compressive mold test, and no less than 12 groups of impermeability test mold test; The insulated quilt is ready; Cover the parade with plastic film; 3. Preparation of machinery and tools

Concrete trucks, ground pumps, grinding pump pipes, concrete hoppers, vibrating rods (40 50 vibrating rods, 8 30 vibrating rods), ash buckets, shovels, iron trowels, wooden trowels, scrapers, plastic brooms, water pipes, rain boots, insulating gloves, etc.