The foundation pit excavation should strictly abide by the principle of "layered excavation". The steel support of foundation pit should be set up in close coordination with the earth excavation, and the central excavation method should be adopted to excavate the earth near the steel support in order to prevent mechanical collision and support. The earthwork near the slope protection pile shall be excavated with manual assistance of small machines and tools. Mechanical excavation of collision steel support and bored cast-in-place piles shall be strictly prohibited. After the earthwork is excavated to the designed elevation, steel support shall be erected in time and prestressed shall be applied to reduce the exposure time without support.
1, foundation pit excavation shall be strictly observed.Stratified excavationThe principle of", the steel support erection of foundation pit support is closely coordinated with earth excavation. During excavation, the center excavation phase method is adopted to excavate the earth near the steel support to prevent mechanical collision and support﹔The earthwork near the slope protection pile shall be excavated with manual assistance of small machines and tools. Mechanical excavation of collision steel support and bored cast-in-place piles shall be strictly prohibited. After the earthwork is excavated to the designed elevation, steel support shall be erected in time and prestressed shall be applied to reduce the exposure time without support.
2, the stability of foundation pit supporting steel support is one of the control of the key factors to the stability of foundation pit, the construction must be accurate in place, and in strict accordance with the design requirements for prestressing, especially pay attention to the stability of the brace, when working in a brace, install each link to do homework carefully, and steel purlin around in the process of production, installation must also ensure its stability﹑Strength and deformation requirements, in addition, from the foundation pit steel support erection to demolition of the whole construction process, the steel support must be strictly monitored to ensure its stability.
3,
Axis deviation during installation of steel support for foundation pit＜5cmAnd ensure that the bearing capacity of the supporting joint meets the design requirements. The steel supports must be connected with symmetrical bolts and tightened in order. At the same time, to prevent excessive deflection of the steel supports during the application of axial force, the deflection should be corrected to the level before the application of axial force.
4,
Before installation of foundation pit supporting steel support, it is necessary to check whether the machined support is vertical, and the non-vertical support should be corrected; Then install the steel support on the leg support and tighten it.
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