What project does the pile foundation belong to?

Question 1: Does the pile foundation project belong to the foundation division? The 5-point pile foundation project belongs to the foundation project and belongs to the sectional project.

Question 2: Does the pile foundation project belong to the foundation pit supporting project? Don't belong. Pile foundation is a type of foundation, including independent foundation, strip foundation, raft foundation and box foundation. Foundation pit support refers to temporary soil and water conservation measures during the excavation of underground buildings, which can take the forms of retaining piles, pile anchors, soil nailing walls, gravity retaining walls, self-stabilizing slope protection surfaces, horizontal truss internal supports, lattice beams and so on. Pile foundation can be used for supporting structure.

Question 3: Does the pile foundation belong to the engineering category? Engineering foundation means that the proposed project is an industrial building, a civil building, a factory building, etc.

Judging from the questions you asked, you are not qualified for this job at all.

Question 4: Does the pile foundation project belong to the main building project? "Unified Standard for Acceptance of Construction Quality of Building Engineering" GB 50300-2001stipulates that "pile foundation division project" belongs to "foundation and foundation division project" and does not belong to Fontaine's main project.

Question 5: What kind of sub-project does the foundation pit supporting pile belong to? Housing foundation pit supporting pile is a measure project in the project, which has no direct relationship with the project and does not participate in the partial evaluation of the project. Just to ensure safety, relevant information should also be put in the safety data, which does not involve the filing of engineering data.

Question 6: The difference between foundation and foundation. In addition, does pile foundation belong to foundation or foundation? I want to write an article about your problem. But then it occurred to me that I couldn't write a good article on a topic. Forget it!

The difference between foundation and foundation.

Let's talk about the writing of Ci Hai first: Foundation: the floorboard of soil or rock that bears the load of buildings. Where the foundation is directly located on untreated natural soil or rock, it is called "natural foundation"; Reinforced foundation is called "artificial foundation", such as soil replacement cushion foundation, compaction reinforced foundation and chemical reinforced foundation.

Foundation: ① The structure that transfers the load of buildings, machinery and equipment to the foundation. There are shallow foundations and deep foundations. Shallow foundation shall be excavated by general method, and the buried depth shall not exceed 3 ~ 4m. Building materials are usually bricks, concrete and reinforced concrete. When designing the foundation, there should be enough R area and buried depth at the bottom to bear and transmit the load. Deep foundation adopts special construction methods and equipment, selects appropriate foundation structure type, and is buried in hard soil with a depth of more than 3 ~ 4 meters. ②……③……

Personally, I think (foundation: the soil layer that bears the load of the building, the compound with the soil after artificial reinforcement, or the rock stratum. There are natural foundations and artificial reinforced foundations. Foundation: it is the structure that transfers the load on the ground to the foundation. Play the role of "connecting the preceding with the following". )

Does pile foundation belong to foundation or foundation?

Chapter 8 of Code for Design of Building Foundation GB50007―2002 divides piles into? : Pile foundation. (If I propose to exclude a single pile directly connected with a column pile, where does the specification classify the pile cap? Personally, I think piles are the foundation of special builders. Terms 2. 1. 1 in Chapter 2 of Technical Specification for Building Pile Foundation (JGJ) 94-2008. A foundation pile consists of a pile set in rock and soil and a cap connected to the top of the pile, or a single pile foundation directly connected by columns. "Technical Code for Building Pile Foundation" classifies the pile set in rock and soil and the cap connected with the top of the pile as the foundation. Code for Acceptance of Construction Quality of Building Foundation Engineering (GB50202―2002) also divides the foundation and pile foundation in the catalogue. So answer whether your pile foundation belongs to foundation or foundation. Belongs to the pile foundation.

Question 7: What are the types of pile foundations? And under what circumstances are various classes used, and how are various classes constructed? Classification of piles

With the continuous development of engineering technology, new steel piles and reinforced concrete piles are more and more widely used in engineering construction. Different pile types have different characteristics.

According to stress classification:

Friction pile-most of the load is borne by the friction of the soil around the pile, and the resistance at the pile end can be ignored.

Foundation pile

End-bearing friction pile-a pile whose load is mainly borne by the friction of the pile body.

End-bearing pile-most of the load is borne by the supporting force of the pile tip, and the side resistance of the pile can be ignored.

Friction end bearing pile-a pile whose load is mainly borne by the resistance at the end of the pile.

According to the classification of construction methods:

Mechanical hole-forming pile

Manual digging cast-in-place pile

Immersed cast-in-place pile

Reinforced concrete pile

Foundation pile precast pile prestressed concrete pile

steel pile

Cement-soil mixing pile

Mixing pile

Stirred reactor of other chemical materials

Classification according to the external dimensions of piles

Long pile

Foundation pile

Short pile

Medium-long pile

Variable cross-section pile

According to the pile sinking method, precast piles can be divided into driven piles, pressed piles, vibration driven piles and threaded piles.

Precast piles can be divided into ordinary reinforced concrete piles and prestressed reinforced concrete piles according to materials. According to the shape of pile section, it can be divided into solid pile and hollow pile, circular pile and square pile, special-shaped pile and so on. The methods of pile extension include steel plate fillet welding, flange bolt connection, sulfur cement anchorage and mechanical connection (such as wedge and pin connection).

According to the construction methods, concrete cast-in-place piles can be divided into vibration sinking piles, rammed expanded piles, steel casing screwed punching piles, mud wall-protecting bored piles, precompressed bored piles, precompressed concrete cast-in-place piles and bored concrete cast-in-place piles.

Frank pile is very popular in Europe, and China is also using this method. This method is suitable for loose sand, gravel and overconsolidated clay. The diameter of pile body is 30 ~ 60 cm, the pile length is 10 ~ 24 m, the weight of core hammer is 25 ~ 50 kn, and the falling distance is 3 ~ 5 m. The allowable bearing capacity of single pile can reach 1500kN. The rotary steel pipe countersunk cast-in-place pile is equipped with hardened steel teeth at the bottom of the steel pipe, which can sink into shale or sandstone layer, and the diameter can reach1.5m. The steel pipe is connected by flanges, and the concrete pile driven into the preloading hole is a kind of pile between the driven pile and the cast-in-place pile. The construction steps are as follows: firstly, the steel dowel is driven into the soil for 0.5 ~ 1.0m, then the steel dowel is pulled out, concrete or mortar is poured into the hole, and then precast reinforced concrete piles are placed in the hole and driven to a predetermined depth. The bearing capacity of this kind of pile is higher than that of ordinary pile.

Bored belled cast-in-place piles have been widely used in residential buildings and high-rise buildings at home and abroad. Mechanical pore-forming, generally 0.6~2.5m in diameter, can be drilled all the way to hard and dense soil or bedrock. However, when drilling holes with sand or silty sand below the groundwater level, casing is needed, sometimes the casing is left in the soil or the wall is protected with bentonite mud. In order to improve the bearing capacity of pile tip, enlarged heads are often set in overconsolidated clay, and the diameter of enlarged heads is about 2 ~ 3 times of the diameter of pile body.

For driven piles, piling on sandy soil foundation will compact the sandy soil around the pile, and the internal friction angle of sandy soil in the compaction area will increase. For medium or dense sand, the surface will rise when piling. For loose sand, the ground surface will sink at the initial stage of piling, and the range distance of sinking and expanding on each side is equivalent to the pile length.

Piling in cohesive soil will also cause the remodeling of soil around the pile, and the shear strength will be temporarily reduced, which can reach 20% ~ 50%. After piling, the shear strength will gradually increase, and sometimes even exceed the original strength. When piling, the friction angle in the soil increases correspondingly, and the side friction resistance of the pile can be determined by standard penetration test.

Piling in clay can also cause surface uplift, and the total uplift is about half of the total volume of pile groups. In deep foundation pit, piling will cause the pit bottom to swell. Due to the limited lateral displacement around, the foundation pit heave is relatively large. In order to reduce uplift pressure, piling should be done before excavation (however, this will reduce the efficiency of piling).

Shallow raft foundation and friction piles with different pile lengths can be used for soft clay layer. Because the amount of earthwork excavated during the construction of compensation raft foundation is the same as the weight of superstructure, the influence range of stress in soil is small and the foundation settlement is very small. However, the long friction pile group may have a large influence range, which will lead to large settlement and deformation of the foundation. In this case, the pile foundation is not necessarily better than the shallow raft foundation scheme. So the plan should be compared.

For friction piles in clay, the pile spacing is generally not less than 3D. When the failure mode of pile groups changes from block failure to single pile failure, the pile spacing should be greater than the optimal pile spacing.

Changing the distance between piles will inevitably affect the size of pile caps. Increasing pile spacing can reduce the number of piles, but the size of pile cap will increase, which will also affect the whole pile. > & gt

Question 8: What is pile foundation engineering inspection? The contents of pile foundation engineering inspection include not only the location, size, distance, quantity and type of piles, the selected construction machinery, pile site energy, site conditions and engineering requirements, the geotechnical properties, buried depth and fluctuation of the bearing stratum of pile foundation, and the depth of the pile tip entering the bearing stratum, but also the strength, deformation and geometric stress of pile foundation, especially the former. (1) Pile foundation strength The pile foundation strength inspection includes the inspection of the structural integrity and bearing capacity of the pile. The structural integrity of pile body refers to whether there are construction defects such as broken pile, necking, segregation, mud inclusion, holes and thick sediment. , commonly used acoustic transmission method, dynamic testing method and core drilling method. Static load test is the most traditional and effective method to detect the bearing capacity of piles. Although this method is time-consuming and expensive, it is still widely used in engineering practice. (2) Deformation of pile foundation The deformation of pile foundation needs long-term settlement observation to obtain reliable results, and the settlement of pile groups under long-term load shall prevail. As long as the structural integrity and bearing capacity of the pile meet the requirements, the pile tip reaches the design elevation and the soil layer does not rise too much, it can be considered as meeting the design requirements. However, settlement observation must be carried out for important projects. (3) Geometric stress conditions The geometric stress conditions of piles refer to the control of pile position, pile inclination, joint conditions, pile top and pile tip elevation, etc. In soft soil areas, the displacement or floating of piles caused by piling or foundation pit excavation often occurs, which should usually be controlled by strict pile foundation construction technology. When necessary, the influence of soil deformation, pore water pressure and pile sinking on adjacent projects should be observed.

Question 9: What is the construction process of pile foundation? Three links and one leveling, entry of pile foundation equipment, conduit sealing test, shelf installation, drilling, hole cleaning, cage lowering, conduit lowering and concrete pouring.

Question 10: Can the pile foundation project be counted as a unit project? What is the legal basis? Ask for advice! High score reward! (I'm in Anhui Province, please don't use other local regulations) Not counting: forming independent use function. That's not enough.

It can only be regarded as a partial project.

Just like people.

The arm is not a person, but a part of the body. It is a limb of the human body. No body, just a piece of meat, no legal basis.

I am in Zhejiang province. It is common sense that people in Zhejiang believe that hands belong to the body and have no legal basis.

I am in Anhui province. Anhui people believe that hands belong to the body and have no legal basis. This is common sense.

I believe all the people in China believe that hands belong to the body and have no legal basis. This is common sense.