Can pine wood be used to lay foundations?

In the process of building houses in rural areas, we often encounter that the foundation is originally farmland or is located by a river or pond, and a weak foundation like this must undergo special treatment to withstand the load of the house. A good way to do this is to use pine piles, which can help to strengthen the foundation and have good stability. Let us Zhejiang wood pile wholesale manufacturers introduce you how to use pine piles to lay the foundation for the house.

Pine piles drive the foundation.

Soft soil is first excavated until it reaches a hard layer. Before piling, the surface of the pine wood is coated with two layers of hot asphalt to prevent corrosion, and the small end is cut into a 30cm long pointed end.

After the sample is placed, the pine stakes are driven, and the piles are arranged in a square. It should be noted that pine wood is rich in pine resin, and there is a saying that "water-soaked pine" cannot replace pine with other wood.

The pine pile is hammered into the inner ring from the periphery of the base, and the original soil at the position of the pile hole is forcibly squeezed, which improves the soil compactness within a certain range around the pile, and also improves the bearing capacity of the foundation.

It is necessary to strictly control the density of the pile and ensure that the pine pile is driven vertically into the bearing layer, so that the deep soil can be consolidated and compacted.

Pinus tabuliformis can be used to lay foundations, because Pinus tabuliformis does not absorb much water, is corrosion-resistant, can be stored underground for a hundred years without deformation, and has strong pressure resistance. So pine wood can be used to drive piles.

Theoretically, yes, but you have to know the mechanical properties and the physical and chemical properties of the material. To achieve "equal strength replacement", on the basis of equal strength, it is necessary to consider factors such as the durability of materials. So it's not a simple generation.

The pine oil you are talking about should be pine oil, pine oil, also known as rosin, is an important chemical raw material, widely used in various industrial sectors, and its main uses are as follows:

1. Soap industry Rosin is steamed with soda ash or caustic soda to form rosin soap. Rosin soap has great detergency, is easily soluble in water, can dissolve grease, and is easy to foam. Rosin is sticky, which makes soap less susceptible to cracking and rancidity.

2. Paper industry Rosin is used as papermaking rubber in the paper industry. Rosin and caustic soda are made of rosin sodium soap, that is, rubber, which is mixed with pulp and added to alum, so that rosin becomes insoluble in water free resin acid particles attached to small fibers, when the pulp is rolled and heated on the drying cylinder, rosin softens and fills between the fibers, this effect is called "gluing" or "sizing". When the paper is "glued", it enhances water resistance, prevents ink penetration, improves strength and smoothness, and reduces stretch.

3. Paint and coating industry rosin is soluble in various organic solvents, and easy to form a film, shiny, is one of the basic raw materials of paint and coating. The function of rosin in paint is to make the paint bright color, dry quickly, and the paint film is smooth and not easy to fall off.

4. Ink industry Rosin is mainly used as a color carrier in printing inks and enhances the adhesion of ink to paper. If rosin is not used in the ink, the ink will be dull and blurry.

5. Adhesive industry Adhesives with rosin ester and hydrogenated rosin ester as the basic raw materials are often used as hot-melt adhesives, pressure-sensitive adhesives and rubber tackifiers.

6. Rubber industry Rosin is used as a softener in the rubber industry, which can increase its elasticity. Disproportionated rosin potassium soap can be used as an emulsifier for synthetic rubber.

7. Food industry Hydrogenated rosin and polyol can be used to prepare an edible rosin ester, which is used to manufacture chewing gum and bubble gum.

8. Electrical industry: 35% rosin and 65% bright oil are used as insulating oil on the cable as a protective film, which plays the role of insulation and heat resistance. Rosin is mixed with bakelite and other man-made resins for insulating varnishes. In addition, the fire paint used for battery sealing and the ointment powder used for bead bonding all contain rosin.

Pine pile is suitable for the foundation with higher groundwater level, such as silt foundation, pine does not rot in the water, as for the depth of the control should depend on the amount of load, generally 100 200 kg hammering to can no longer enter the foundation shall prevail, the current use of pine pile construction cost is higher. and not secure.

When we are building a house, the first thing we need to do is to drive the pile, which requires the piling wood to drive the pile. Piling timber is the foundation of the load-bearing part and is generally used for soft foundations or large structures. Rational use of the soil between the piles and the resistance bearing of the pile circumference, due consideration of the bearing capacity of the pile end, give full play to the compacting effect of the pine pile and the effect of the soil between the piles, strengthen the overall strength of the structure, and meet the reliability and service life of the structure.

West porcelain Jianping wood industry **** main: piling wood, marsh pine, larch, fir, log wholesale, wood processing, is a set of production, processing, sales as one of the timber company, operating involving all kinds of specifications of solid wood boards, piling wood processing and punching, the company has established a long-term and stable cooperative relationship with a number of retailers and merchants, won the trust of our customers.

1. Before the pine pile is applied, a 30-thick stone chip layer should be filled in the construction area and lightly rolled to meet the convenience of the diesel pile driver working on the substrate.

2. The construction of pine piles is driven by small diesel pile hammers, and the verticality deviation is required not to exceed, and the selected pine piles can not have insect eyes and knots.

3, the selection of the construction sequence, give priority to the construction of important parts, according to the order of the flow of water in the first outside and then in the construction, first the outside of the construction lane to the middle of the pushing, and finally carry out the middle of the driving lane, when the wooden pile is applied to meet the depth of 5 meters and the resistance is larger, the number of hammer strokes continues to increase, and the pile driver can be removed.

4. It is recommended to carry out a test drive to determine the foundation bearing capacity index method of the soil between the piles. Record the number of hammers required per meter of depth in the piling process, clarify the number of hammers required to collect the hammer, whether there is a sudden sinking of the pile and the phenomenon of ground settlement, carry out geotechnical tests on site to test the physical performance indicators of the soil after the completion of the beating work, according to the physical performance indicators of the test soil and the parameters of the pine pile when driving and the resistance existing in the process of driving, the design pile length or pile spacing arrangement is appropriately adjusted, and after the pine pile is completed, the stable layer of gravel between the filling piles is carried out.

The stone chips are graded to the top of the pile for rolling, and the filling material above the top of the pile can be rolled with flake stone or crushed stone.

5. After the completion of construction, the porosity ratio of the soil is determined by the geotechnical test, and the bearing capacity of the medium-spacing soil is determined by the small static load test as the basis for structural design, so as to meet the safety requirements within the service life of the structural design.

7. Defect analysis.

Because the pine pile must be in the position of the groundwater level is more developed, completely placed in the water and the state of the vacuum is relatively vacuum, if due to the seasonal influence, the durability of the pine pile is caused by wood decay when the water level is depleted, and the wood decays, causing structural failure, so whether the anti-corrosion problem of the pine pile needs to be treated with special technology, and whether the structural reliability requirements can be met within the design service life.

First, the skin of the pine wood is burned into charcoal, the thin ends of the tree are cut into sharp points, and then manually or mechanically pressed down, and the density specified in the drawings is beaten. For areas where the groundwater level changes greatly or the groundwater is highly corrosive, pine piles should not be used.

Because the strength and deformation resistance of the pile are better than the soil, the bearing capacity and modulus of the composite foundation after formation are also better than the original soil, so as to reduce the deformation and improve the bearing capacity.

During the construction of pine piles, hammering is used to drive in, and the original soil body at the position of the pile hole is forced to be extruded laterally, so that the compactness of the soil layer within a certain range around the pile is improved, and it plays a role in compaction. The compacting effect of pine pile composite foundation on the soil between the piles in the construction makes the soil between the piles compact, so that the bearing capacity of the soil between the piles is improved and the compressibility is reduced.

According to the different methods of piling, it can be divided into manual and mechanical piling.

Commonly used piling machinery are hand hoists and diesel pile drivers, and hydraulic excavators are also often used to drive wooden piles. When piling with a hydraulic excavator, two people need to support the pile in place, turn the bucket upside down and press the wooden pile, press the wooden pile into a certain depth of the foundation to stabilize itself, and then let the pile supporter go away, and the pine pile will be pressed down by the excavator, and a pile can be driven every 3 5min generally, and the work efficiency is higher.

In order to make the compaction effect good and improve the bearing capacity of the foundation, the pile must be driven from the periphery of the foundation to the inner ring. The arrangement of the pile is better in the shape of plum blossoms, and the distance between the piles should not be less than 3 times the pile diameter.

After the piling is completed, the pile head should be sawed flat according to the design elevation, so that the pile top of each pile is basically kept in the same horizontal plane, the silt extruded during piling is excavated, the 20 30cm thick graded sand and gravel cushion layer is laid on the pile top and compacted, and then the bottom plate concrete is poured to ensure that the foundation transmits a part of the load to the soil between the piles through the cushion layer, and adjusts the sharing of the pile and the soil.

Under the foundation, the bedding cushion can reduce the pile-soil stress ratio, give full play to the effect of the soil between the piles, can increase the value, reduce the stress concentration of the foundation bottom surface. By varying the thickness of the mattress cushion, the thinner the shared mattress cushion for adjusting the vertical load of the pile, the higher the percentage of the load borne by the pile to the total load, and vice versa. If there is no bedding, it can not play the role of soil between piles.

Summary: Treating soft foundations with pine stakes is:

The construction method of pine piles: first burn the skin of the pine wood into charcoal (it is the skin), cut the thin end of the tree, and then press it down manually or mechanically, and hit it down according to the density specified in the drawing

Just keep fighting, huh? What do you use.

Pressing down with a machine, depending on the soil and the like, the stake can also be sharpened

1. Avoid too soft soil.

If the foundation with uniform soil quality is selected, it can maintain the balance of force, which is conducive to the safety of the house structure to a certain extent. Do not choose loose soil for the foundation of the house, or half loose and half hard soil, these two types of soil foundation can not maintain the balance of the force of the house, under the influence of external forces, it is easy to cause the house to settle. Don't choose clay, which has poor water permeability, which can easily make the house damp and full of bacteria, which can affect the health of the occupants.

2. Avoid uneven terrain.

The foundation should be flat, because the structural stability of flat terrain is stronger, and the safety of natural houses is higher. The foundation should not be located on the slope, although some slopes appear flat on the surface, but their interior is not necessarily flat, and landslides should be avoided.

3. Avoid high groundwater level.

If the groundwater level is too high, it will make the house very wet, and there is a risk of collapse, and it may also pollute the groundwater, which will allow diseases to spread through the groundwater, thus affecting the health of the occupants.

In the past, either no piling was driven or it was a wooden pile. In the past, there are houses that have not fallen down for hundreds of years, so it cannot be said that the wooden piles are necessarily not strong. But wood is susceptible to corrosion and decay, which has a fundamental impact on the structure.

Therefore, if you want to use wooden piles, you must deal with the problem of anti-corrosion, otherwise, it is recommended that you still use cement piles.

The specific need depends on what terrain it is, for example, many bamboo buildings in Sichuan are wooden pile foundations. Most of the buildings are now built with concrete foundations.

Foundation refers to the soil or rock mass that supports the foundation underneath the building. The soil layer that serves as the foundation of a building is divided into rock, gravel soil, sand, silt, clayey soil and artificial fill. There are two types of foundations: natural foundations and artificial foundations.

A natural foundation is a natural layer of soil that does not need to be reinforced by man. Artificial foundations need to be reinforced, and there are stone chip cushions, sand cushions, mixed ash backfill and then tamping, etc.

This is because the nails inside, wood, can easily affect his structural operation, so there must be no nails and wood at this time.

Why can't there be nails and wood in the foundation, because nails are easy to corrode, and wood is often easy to corrode, so it is not strong.

When building a house and laying the foundation, you need to have an auspicious one, and wood with nails is an unlucky thing, so it is better not to put it in it.

1.Compaction method: use a heavy hammer or road roller to tamp or compact the soft soil layer, squeeze out the air between the soil particles, and improve the density of the soil to increase the bearing capacity of the soil layer.

This method does not use materials, is more economical, and is suitable for the situation that the bearing capacity of the soil layer is not much different from the design requirements;

2.Soil replacement method: when the local foundation soil is partially or completely weak soil, which is not suitable for reinforcement by compaction method (such as silt, swamp, miscellaneous fill, holes, etc.), the local or all weak soil can be removed and replaced with good soil, such as coarse sand, medium sand, sand and gravel, ash, etc.

The cost of this artificial foundation is higher than that of the compaction method.

3.Piling method: the pile body is placed in the weak soil layer, and the building is built on the pile, so it can also be called the pile foundation; (This artificial foundation is suitable for the situation that the bearing capacity of the foundation is small, and the total load of the building is large, but the cost is higher).

The main contents of the foundation in the building include: the physical properties and rock and soil of the foundation soil.

Classification of DAO, stress in the foundation, calculation of the capacity deformation of the foundation in the ground, shear strength of the soil and bearing capacity of the foundation, calculation principles of the building foundation, design of shallow foundation of natural foundation, inspection of foundation groove and local treatment of foundation, design of soft soil foundation and pile foundation.

The pile foundation is dug deep, and the strength of the bearing layer is higher, which is more practical.

The material used in the box-shaped foundation is larger, which is the reason for its high cost, and it is not very practical due to the limitation of the strength of the bearing layer.

Strip foundation is more commonly used for general good foundations, because the cost is cheap and the construction is simple.