Supporting system for shear key of deep foundation pit

Abstract

The invention discloses a supporting system for a shear key of a deep foundation pit and belongs to the technical field of rock construction. The supporting system comprises a supporting pile, a tension mechanism and a thrust mechanism, wherein the tension mechanism comprises a traction anchor cable which is arranged on the outer side of the foundation pit; one end of the tension mechanism is fixedly connected to the supporting pile while the other end of the tension mechanism is fixed by the traction anchor cable; the thrust mechanism comprises the shear key which is made from a rigid material; one end of the thrust mechanism is fixedly connected to the supporting pile while the other end of the thrust mechanism is fixed by the shear key; and the position of the supporting pile is in a constant state by means of the joint action of the tension mechanism and the thrust mechanism.

Description

technical field [0001] The invention relates to the technical field of rock and soil construction, in particular to a shear key support system for deep foundation pits. Background technique [0002] With the rapid development of cities, land resources are increasingly scarce, and urban construction uses more and more underground space. As an indispensable part of underground space utilization, foundation pit support is becoming more and more diversified, and support technologies are also becoming increasingly Mature. With the continuous development of high-rise buildings and the use of underground space, the establishment of corresponding multi-storey basements, underground tunnels, subways, commercial streets, etc., makes the projects to be built often adjacent to high-rise buildings or underground structures. It also prevents the support structure of the foundation pit from temporarily occupying the space beyond the red line of the site, so that the use of anchor systems ...

AI Technical Summary

Problems solved by technology

The traditional internal supports mainly include temporary steel supports, temporary concrete supports, and basement upside-down methods. However, temporary steel supports have poor bending resistance and overall stability. The small support force often results in small support spacing and large steel usage. Earthwork excavation construction has a great impact, installation and removal during construction and the requirements for support and protection measures are high, and the cost is high

The temporary concrete support can be poured into an optimized layout according to the plane shape of the foundation pit, and the support has the advantages of high rigidity, good overall stability, large force, and convenient construction. However, it is a temporary project. With the construction stage of the basement structure The internal support needs to be demolished. The demolition construction is difficult and the construction period is long, which will easily affect the surrounding safety. The temporary concrete internal support cannot be reused. After the demolition, a large amount of construction waste will be generated, resulting in a large waste of resources.

Although the traditional basement upside-down method does not require an additional support system, it has special requirements for the basement structure and foundation form, requiring a large number of prefabricated structural columns, and the basement foundation must use pile foundations, and it is in the form of one column and one pile, and the structural nodes are complicated. , the construction process is complicated, the construction technology requirements are high, there are unfavorable factors such as the need to increase a large number of pile foundations, and the earthwork needs to be excavated.

Images