For areas with large changes in groundwater level or where groundwater is highly corrosive, pine piles should not be used. So, how are pine piles constructed? Next, Xiaobian gave everyone a talk about pine pile construction plans and precautions, and I hope everyone can help.
Pine pile structure
Pine wood is rich in turpentine, and rosin can well prevent groundwater and bacteria from corroding it. It is said that “water is immersed in perennial pinesâ€, so pine wood piles are suitable to work below groundwater level. However, pine piles should not be used in areas where groundwater level changes are relatively large or where groundwater is highly corrosive. Well-known water conservancy projects - the foundation treatment of Lingqu are using pine piles.
Pine pile construction plan
First, the construction process
Measure the pay line → dig, fill the work surface → stake out stake → loosen the stake → saw the flat pile head → rubble embedded pile and C10 cushion construction → bearing platform construction.
Second, the construction preparation
1 Piling purchase and storage
A. The wooden stakes are mainly purchased in the local timber market and transported to the on-site warehouse on the construction site by car; wooden stakes should be paid attention to when purchasing wood piles, and the pile length should be slightly larger than the designed pile length. The pile wood used must be of uniform material and must not be bent too much. When the two ends of the stake are connected in a straight line, the degree of deviation between the center of each section and the straight line shall not exceed the relevant provisions; the other stake shall not have any defects such as boring, cracks or other damages that may damage the strength.
B. When lifting, loading, unloading and stacking of piles, the piles shall not be subjected to impact or vibration so as to avoid damage to the piles. When the stakes are used, they should be used in the order they are delivered to the construction site. The integrity of the stakes should also be checked. The storage foundation for stakes must be solid and flat, and there must be no sinking phenomenon to avoid deformation of the stakes.
2 test piles, determine the length of the pile.
Due to the long bank, a test pile is drilled every 50m along the embankment. Therefore, 25 test piles are selected to determine the length of the pile. The geological report shows that the silt depth is 1.2m-3.2m. To ensure the success of the test pile, and considering the particularity of this type of pile, the length of the pile is 0.5 meters larger than the effective length of the same pile.
3 Before piling, the top of the pile shall be sawed and leveled first, and the pile body shall be protected. There shall be no impact damage that may affect the function. The wire should be fastened with the wire at the pile head.
4 Making of pine stakes
A. The pile diameter is strictly controlled according to the design requirements, and the shape is straight and straight;
B. The tip of the small end is cut into a 30cm long tip, which is conducive to beating the people.
C. When piles with more than 80% of the total number of piles are to be prepared, the excavator is transferred to the pile for construction to prevent the excavator from waiting for piles to work.
D. Prepare piles to be in place according to different sizes and their use areas to prepare for piling;
F. It is forbidden to use sand and other wood instead of pine wood.
5, measurement lofting
Before the construction of the pine stakes, the surveyors shall set out according to the design drawings to determine the stakes for each stake and use the stakes for measurement to mark it.
Third, saw the pile head
1. Control the elevation after sawing the pile head according to the design height.
2. The pile head should be about 0.6m away from the top of the silt, in which 0.4m stone is thrown into the base and 0.2m is inserted into the foundation, which is integrated with it.
Fourth, quality risk
1. According to the geological conditions at the construction site and the construction drawings, after the completion of the embankment, it is necessary to fill the soil on the back of the embankment, and the other side of the embankment is a riverbed. The river bed deposits silt and thick gravel clay. If a pine stake is used for the gate During the foundation treatment, the pine piles are prone to horizontal displacement under the effect of the self-weight and filling of the Maoshi riverbank, affecting the quality of the embankment; in addition, the strength of the soft soil is very low, the compressibility is high, and the raw material quality of pine piles is The specifications are difficult to be consistent, and it is difficult to control the degree of irrigation when driving piles, and cracks occur when subjected to large loads of the river banks.
2. The water content of silt or silt soil is high, and the permeability coefficient and undrained shear strength are low. When a large number of pine piles were concentrated, the pore water in the saturated soil was not exhausted and the pore volume did not change. The increment of all the pressure was completely borne by the pore water, and the pressure between the sluice ground particles did not change. The shear strength of the gate soil is not only not improved but may also be reduced due to construction disturbances. In addition, due to the construction of pine piles, the silt between piles need not be cleaned. When the disturbed sludge is reconsolidated, the phenomenon that the load of the retaining wall is directly carried by the pine piles may occur.
Precautions
Some questions to note when using pine stakes:
1, pine pile is the use of "log", do not saw into other shapes, in particular, can not be sawed into a semi-circular shape, semi-circular pile is quickly bent after a long time, and even lose its effectiveness.
2. Do not promote "pine piles" as "fir stakes" or other piles. Most of the common wood is water-repellent, and it quickly turns black, deformed and decayed in the water. This is especially true of fir, and it is not available. Of course, there are other wood materials that can be “blisted for thousands of years,†such as mahogany.
3, pine pile composite foundation design method is similar to ordinary composite foundation, but the pile center distance is often very small.
4, to take into account the pine piles can withstand the impact of the pile sinking, pile impact energy are within 300kg.m; and then big, even the log 16cm tail diameter can not stand.
5. The horizontal resistance of foundation soil in silt area is very small, and the upper level of pine pile group is easy to have overall horizontal displacement, which causes damage to the surface facilities; therefore even if the earthquake horizontal load is not taken into account, most of them are also laying a stone layer between pine piles. Improve the horizontal stiffness of the pile group. Blocks of stone can only be artificially laid, and pine piles should be squeezed one by one.
Editor's summary: The relevant information on the construction methods and precautions for the pine stakes has been introduced here for everyone. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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