How to design spiral pile more reasonable has been a concern of many users, for the design should be reasonable, and practical. Xiaobian for you to introduce the spiral pile design attention to details.
Screw pile design and construction, the engineering geological and hydrogeological conditions be taken into account, the upper structure type and use function conditions, load characteristics, construction technology and the environment, and should attach importance to local experiences, adjust measures to local conditions, pay attention to design, rational selection of pile type spiral pile, pile process and form of pile caps, optimize the cloth pile, save resources, At the same time, the construction quality control and management of spiral pile are strengthened.
Spiral pile foundation should be designed according to the following two limit states:
1. Limit state of normal use: the spiral pile foundation reaches the deformation limit specified in the normal use of buildings or reaches a certain limit of durability requirements.
2. Ultimate state of bearing capacity: screw pile foundation reaches maximum bearing capacity, overall instability or deformation unsuitable for continued bearing;
Requirements for soil quality
1) The stirrup of photovoltaic spiral pile affects the dehydration and gelation time of sodium silicate, thus affecting the sand casting hardening rate. After the water exceeds the must, the molding sand can not harden. The normal moisture content of raw sand does not exceed 0.5% (mass fraction).
2) The dust content of raw sand of photovoltaic spiral pile affects the molding strength of organic ester self-hardening glass sand of certain formulation. The dust severely expands the specific surface area of sand, and consumes sodium silicate binder, greatly reducing the strength of sand. In order to make the sand reach usable strength, sodium silicate has to be added into the pile to deteriorate the collapsibility of the sand. Therefore, the request of the original sand powder content is less than 1% (quality naan fraction).
3) The residual modulus of recycled sand of photovoltaic spiral pile influenced the process performance of molding sand. To fully affect the use of sand cutting, especially in high temperature season, with residual quotient modulus sodium silicate film containing high reclaimed sand as the original sand, with ordinary sodium silicate manufacturing sand, photovoltaic spiral pile has no time to use, photovoltaic spiral pile has to use ultra-low modulus modified sodium silicate and very slow organic ester. Add sand cost, and remove sand residual strength.
