1, ready
(1) Construction preparation: Before driving the steel sheet pile, the notch at the pile tip should be closed to prevent mud from squeezing in, and the lock should be coated with butter or other grease. For steel sheet piles that have been in disrepair for a long time, the lock mouth is deformed and corroded seriously, so it should be repaired and corrected. Bending pile can be corrected by hydraulic jack or drying.
(2) The division of piling flow section.
(3) When piling. In order to ensure the verticality of steel sheet piles. It is controlled by two theodolite in two directions.
(4) Ensure that the position and direction of one or two driven steel sheet piles are accurate, so as to play the role of guiding formwork. Therefore, it shall be measured once every 1m, and the steel bar or steel plate shall be welded to the purlin bracket for temporary fixation immediately after reaching the predetermined depth.
2. Equipment preparation
1. Impact piling machinery: free drop hammer, steam hammer, air hammer, hydraulic hammer, diesel hammer, etc.
2. Vibrating piling machinery: This kind of machinery can be used for piling and pulling piles, and the common one is vibrating pile hammer.
3. Vibration impact piling machinery: This kind of machinery is equipped with an impact mechanism between the body of the vibration pile driver and the fixture, which produces impact force while the vibration exciter vibrates up and down, greatly improving the construction efficiency.
4. Static pile driver: the sheet pile is pressed into the soil by static force.
Step 3 establish
(1) type selection.
Single play starts from the corner of the slab wall and is set block by block (or two blocks as a group) until the end of the project. Its advantage is that the construction is simple and fast, and no other auxiliary support is needed. Its disadvantage is that it is easy to tilt the sheet pile to one side and it is not easy to correct the error after accumulation. Therefore, the singles method is only applicable to situations where sheet pile wall's requirements are not high and the length of sheet piles is small (such as less than 10m).
(2) Screen driving method: 10-20 steel sheet piles are inserted into the guide frame in rows in a screen shape, and then driven in batches. During piling, the steel sheet piles at both ends of the shadow wall are driven into the design elevation or a certain depth to become positioning sheet piles, and then the sheet piles are driven into the middle step by step according to the heights of l/3 and 1/2. The advantages of screen-driven method are: it can reduce the accumulation of tilt error, prevent excessive tilt, easily realize closure, and ensure the construction quality of sheet pile wall. Its disadvantage is that the self-supporting height of inserted pile is large, so attention should be paid to the stability and construction safety of inserted pile.
(3) The setting of steel sheet piles.
When piling, the driving position and direction of the first and second steel sheet piles to be driven at the beginning should be ensured to be accurate, which can play the role of template guidance. Generally, it should be measured once every1m. Special-shaped sheet pile, joint method, lap joint method and axis adjustment method can be used for corner and closure construction of steel sheet pile. In order to ensure construction safety, attention should be paid to observing and protecting important pipelines and high-voltage cables within the operation scope.
(4) Pull out the steel sheet pile.
When backfilling the foundation pit, the steel sheet pile should be trimmed and pulled out for reuse. Before pulling out, it is necessary to study the pulling out sequence, pulling out time and pile hole treatment method of steel sheet piles. In order to overcome the resistance of sheet pile, according to the pile pulling machinery used, the pile pulling methods include static pile pulling, vibration pile pulling and impact pile pulling. When extubating, attention should be paid to observing and protecting important pipelines and high-voltage cables within the operation scope.
What is the function of steel sheet pile?
Function, appearance and practical value are the standards people adopt when choosing building materials. The steel sheet pile meets the above three points: the elements of its manufacturing components provide a simple and practical structure, which meets all the requirements of structural safety and environmental protection, and the buildings built with steel sheet piles are very attractive.
The application of steel sheet piles runs through and extends to the whole construction industry, from the use of traditional hydraulic engineering and civil technology, through the application of railways and tramways to the application of environmental pollution control.
The practical value of steel sheet piles has been reflected in the innovative production of many new products, such as: some special welded buildings; Metal plate made by hydraulic vibration pile driver; Treatment of sealed sluice and factory paint. Many factors ensure that steel sheet pile is still one of the most useful manufacturing parts, that is, it is not only conducive to the Excellence of steel quality, but also conducive to the investigation and development of steel sheet pile market; It is conducive to the optimal design of product characteristics and better meet the needs of users.
The development of special sealing and printing technology is a good example in this regard. For example, HOESCH patent system, its appearance has created an important new field in pollution control of steel sheet piles.