What Are the Advantages of Wood Pallets?

The wood pile is a component for building a cofferdam, which is composed of a tongue and groove on one side and a tongue on the other side, and a sloped lower side of the plank. Such members are driven into the soil in the prescribed order, and the tongue and groove are closely adjacent to the tongue, forming a wooden pile cofferdam. The wood pile is a commonly used retaining structure in foundation pit support, which mainly plays the role of retaining soil and has a certain water blocking effect.

Structurally, the planks are similar

A cofferdam is a temporary water-retaining building in a diversion project. It is used to protect the foundation pit during construction and to ensure that hydraulic structures can be constructed on dry land. The form of cofferdam should be selected according to the working conditions of the cofferdam and the technical and economic comparison. In the construction of the Songhua River Fujin Abutment, the sand pile artificial island construction with good water permeability was used for the construction of the bored pile foundation. For major and other unfavorable conditions, after comparison, wooden pile cofferdams are selected as temporary water-retaining buildings. After use, the results are good. The wood pile cofferdam is suitable for the area where the wood is more convenient. The river bed can lay down the wood pile. The water depth is large and the flow velocity is high. The board pile cofferdam consists of positioning piles, guides, supports and board piles. When the depth of the foundation pit is less than 2m, a single-layer or double-layer wooden pile (internal soil filling) can be set according to the water depth, the size of the cofferdam of the foundation pit, and the anti-seepage requirements. When joints are set up for wood piles, herringbone or high-low seams can be set for small thicknesses; bumps with thickness greater than 10 cm can be made. When the water leaks at the joints are severe, the sheet piles can be lined with colorful strips or an external weir or straw bag cofferdam can be added. The board pile cofferdam has the advantages of simple construction, easy maintenance, simple material acquisition, low cost, etc., and also has certain ability to resist and seepage. The construction of the Nenjiang Yaersai embankment sluice project and the Zhongnan Yinzhuangtou Intake Sluice Project in Daqing City are using wooden pile cofferdams to block water, with good results ^[2]

In the construction of deep foundation pits, there are two common types, namely grading and support excavation. Nowadays, the number of construction projects is gradually increasing. In construction projects, it is easy to be restricted by the surrounding conditions. Therefore, support and excavation construction methods are generally used. The basic functions of a deep foundation pit project mainly include the following: ensuring the safety and stability of the construction conditions of the underground space of the construction project; ensuring the safety of the main structure foundation construction; ensuring the safety of the construction environment, including tunnels, buildings, underground Utilities and more. In traditional deep foundation pit construction, the calculation of foundation pit construction parameters must meet the stability requirements, and it is easy to ignore the calculation and analysis of slope instability. Nowadays, in the construction of deep foundation pits in construction projects, the surrounding construction environment needs to be comprehensively considered, and in the calculation of construction technical parameters, the foundation pit deformation control needs to be comprehensively considered. In particular, it is necessary to pay attention to the complex geological environment, hydrological conditions and other factors in the construction of bad geological conditions such as soft ground. In deep pit support, the three main methods are hybrid support structure, cantilever support structure and gravity retaining wall support structure. The cantilever supporting structure is more suitable in the case where the excavation depth of the foundation pit is small and the soil conditions are good. The gravity retaining wall uses its own gravity to ensure the balance of the supporting structure under the remaining external forces. Hybrid support structure is the simplest, which is another name for anchor structure. With the help of the anchor rod and the sprayed concrete surface layer, the foundation pit and the supporting structure form a relatively complete whole. At the same time, the two will interact with each other to ensure the safety of the foundation pit support. Where economic conditions permit, safety and stability are necessary prerequisites for selection.