A steel-supported cone-wedge extended active end device and its construction method for coordinated construction of foundation pit groups

Abstract

The present invention is a steel-supported cone-wedge-extended active joint device and a construction method thereof for coordinated construction of foundation pit groups. The center point of the limiter with the jack mounting plate is aligned with the center point of the cone-wedge-shaped support with flanges , to form the same bearing axis; the cone wedge-shaped support with flange and the steel support steel pipe section are connected by flange; the positioning hole with the flange inclined splint is pierced on the smooth round rod of the limiter with the jack mounting plate The stress diffusion bearing plate is clamped on both sides of the limiter with the jack mounting plate, and is anchored on the ring beam or purlin of the foundation pit enclosure structure through the fixed anchor rod, which bears the horizontal stress of the flange with the inclined splint. The force is diffused and transmitted to the ring beam or purlin of the foundation pit enclosure structure; the invention is suitable for the application of pre-added axial force of the steel support and the load diffusion of the support end in the collaborative construction of adjacent foundation pits, and reduces the adjacent foundation pit group in the collaborative construction. The asymmetric support of the foundation pit causes the load concentration and unbalance of the end-bearing area of ​​the intermediate partition wall.

Description

technical field [0001] The invention relates to a steel-supported cone-wedge extended-type active end device and a construction method for the collaborative construction of foundation pit groups, which is suitable for the application of pre-applied axial force of steel supports and the spread of load at the support end in the collaborative construction of adjacent foundation pits. The asymmetrical support of adjacent foundation pits in the cooperative construction of foundation pit group under the condition of reducing the weakness of the middle pier wall causes the load concentration and unbalance of the end bearing area of ​​the middle partition wall. The utility model belongs to the technical field of foundation pit engineering construction auxiliary workpieces. Background technique [0002] The steel support of foundation pit is widely used in the construction of open excavation method. During the installation of steel support, the application of pre-loaded axial force i...

AI Technical Summary

Problems solved by technology

The disadvantages of these two types of active devices are: the steel wedge force transmission method is unreliable, it is easy to cause stress concentration and eccentric force, the nodes are unstable, and the integrity is poor

Especially when the ground soil is soft, the ground at the upper steel support is prone to deformation to the outside of the foundation pit, causing the steel support to loosen and fall off

Another kind of bolt-fastened cone-wedge active end, although it solves the problem of unreliable force transmission method of steel wedge, but the force transmission mechanism is too complicated, and the bearing force of the axial end of the support is partially transmitted to the transverse bolt to bear. The fastening quality requirements are too high, high-strength bolts are required, and some steel materials are demanding, and there are also unreliable factors

None of the above active end devices is suitable for the problem of concentrated and unbalanced loads in the middle partition wall caused by the asymmetric support of adjacent foundation pits in the coordinated construction of foundation pit groups

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