In general, the plane support system should be preferred, for those who meet the following conditionsThe foundation pitVertical diagonal brace system can also be used.
(1) The foundation pitExcavation depth, generally not greater than6mIn soft soil area with high groundwater level is not greater than5m.
(2The engineering geological conditions of the site can satisfy the installation of diagonal support of the reserved soil embankment in the foundation pit and the stability of the reserved slope.
(3The diagonal support foundation has sufficient horizontal and vertical bearing capacity.
(4) Foundation pit plane scale is large, the shape is complex.
1.Composition of vertical diagonal brace system
The vertical diagonal support system is usually composed of diagonal support, waist beam and diagonal support foundation components. When the diagonal support length is greater than 15mWhen, the column should be set up in the middle of the diagonal support.
Inclined support should be made of steel or composite steel section; The vertical diagonal support should be evenly and symmetrically arranged, and the horizontal spacing should not be greater than 6m; Brace andThe foundation pitThe Angle between the bottom surface should not be greater than under normal circumstances 35°In soft soil area with high groundwater level should not be greater than26°And it is consistent with the stable slope of the soil embankment in the foundation pit. The horizontal distance between the inclined support foundation and the retaining pile should not be less than the insertion depth of the retaining pile below the excavation face1.5 Times; The connection between the diagonal support and the waist beam, the diagonal support and the foundation, and the waist beam and the parapet wall should meet the transmission requirements of the horizontal and vertical components of the diagonal support.
2.Arrangement of vertical diagonal brace system
The function of vertical diagonal bracing system is to transfer the lateral pressure on retaining pile through diagonal bracingThe foundation pitOn the foundation below the face. Its construction process is: after the retaining pile is completed, the soil layer in the middle of the foundation pit is excavated by slope excavation, and then the diagonal support is installed, and then the soil slope left around is excavated. For the foundation pit with large plane size and irregular shape, but shallow depth, the construction of vertical diagonal bracing system is relatively simple and can save supporting materials.
When using vertical inclined support system, becauseThe foundation pitIt is more convenient to excavate the earthwork in the middle of the country by slope excavation. The larger the plane size of the foundation pit, the larger the proportion of earthwork in this part will be, which is conducive to speeding up the construction progress. For foundation pit with complex plane shape, it is more convenient to arrange vertical diagonal bracing system than plane bracing system.
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