Now we are based on China's new industrialization era, for China's water conservancy defense and China's construction industry unremitting efforts, in similar construction occasions, you may be able to see a strip of piles are being used, you may not know what it is called, in fact, you see a strip of piles is a pre-stressed concrete sheet piles, which has a lot of usefulness, pre-stressed concrete sheet piles manufacturers need to pay attention to a lot of things in the construction of matters there are also. The following small editor to explain in detail one by one:

　　Precautionary measures to be taken for pile de-tenonization and tilting.

　　In the process of pile sinking, the prevention and treatment of common quality problems such as broken pile top, cracks in pile body and difficulties in pile sinking are basically the same as that of general reinforced concrete square piles, and here only the specific problems of de-tenonization and tilting in the construction of prestressed concrete sheet piles are elaborated.

　　(1) The size and straightness of the concave and convex tenon of prestressed concrete sheet pile do not meet the design requirements, which is the main reason of de-tenonization. Therefore, it is necessary to check and accept the pile one by one before construction, so as to avoid the above pile body being driven into the soil.

　　(2) When the pile tip and pile body are not on the same axis or when one side of the pile tip encounters hard soil or foreign object during pile sinking, the pile body will rotate (i.e. the pile body will rotate).

　　The pile body will rotate (i.e. the pile cross-section will make an angle with the axis of the sheet pile wall), and if no timely measures are taken, the pile will certainly be de-tenoned. In this regard, prefabricated piles should first be carefully inspected and acceptance, and piles with tip and body not on the same axis should not be used. In addition, when the pile body rotates in the process of pile sinking and it is impossible to pull out the pile, the guiding purlins on both sides corresponding to the sheet pile with a tendency to rotate can be welded on each side of the guiding purlin, and each of them is welded with a small limit with sufficient strength made of section steel, which is tightly attached with the sheet pile body (the tightly attached place is required to be smooth and . Good is rolling contact), and then continue to slowly and carefully apply the pile. After the above corrective measures can generally be corrected, at least to prevent the development of de-tenonization, the success of the measures in the early detection of de-tenonization trend, early implementation of corrective measures.

　　(3) Some sheet piles have a cutting angle between the convex tenon side, the designer's intention is to facilitate the pile body to break the ground into the pile body, but in the process of pile body into the ground at this cutting angle if encountered with small stones or other hard objects, the pile body is easy to occur off the tenon tendency, so it is recommended to abolish the above cutting angle.

　　(4) The inclination of the front and back direction of the sheet pile wall, when inserting the piles, pay attention to the tip of the pile and the top of the pile to control on a vertical line (i.e., the top of the pile and the walnut groove are kept on the same vertical line) can be. Especially the starting pile (positioning pile) should pay more attention to control, because the notch of the pile is the guide and "backing" of the verticality of the sheet pile wall formed later. Therefore, the positioning of the starting pile requires zero error control, and then insert the pile after confirming that there is no error, which is extremely beneficial to the construction control in the future.

　　(5) Sheet piles are often tilted to the direction of wall formation (i.e. the direction of pile notch) after sinking one by one. The main reason is that when inserted (driven), the frictional resistance between the pile body of the inserted (driven) pile and the previous pile is greater than the side frictional resistance between the other side and the soil body. In addition, the tip of the sheet pile generally has a beveled angle on the dowel side in addition to the locating pile, and because of this beveled angle, the sheet pile will be driven tighter and tighter against the previous pile during the driving process. The intent of this design is to allow the sheet pile wall joints to be lapped without dislodging the mortise. However, it will also make the frictional resistance between the pile and the previous pile greatly increase during the pile driving process, thus increasing the chance of pile inclination generation. Therefore, in the construction of sheet piles, a tendency to gradually tilt in the direction of sheet pile wall formation generally occurs. For this reason, the use of the screen method of construction instead of the root-by-root driving process can fundamentally reduce the chance of pile tilting occurring. To further avoid, minimize and correct the occurrence of the above pile tilting, the following measures can also be selected again:

　　a. Provide "locating angle iron" on the purlin and tighten it with the inserted pile to limit the tilting tendency towards the pile. Butter can be applied between the "positioning angle iron" and the inserted pile to facilitate the insertion of sheet piles.

　　Understanding construction details

　　(1) Before driving in the pile, the notch at the tip of the pile should be closed to avoid soil squeezing in, and the lock should be coated with butter or other grease. For the old age, lock mouth deformation, corrosion serious steel sheet pile, should be refurbished and corrected, bending deformation of the pile, can be used to correct the hydraulic jack jacking or fire baking and other methods.

　　(2) Division of piling flow section.

　　(3) In the process of piling. For verticality of steel sheet piles. Use two sets of latitude and longitude instruments to control in two directions.

　　(4) The position and direction of one or two steel sheet piles should be started so as to play the role of guiding sample, so every 1m should be measured, and immediately after hitting to the predetermined depth, the steel bar or steel plate should be welded to the purlin bracket for temporary fixing.