Beam-type connecting node for special-shaped double-row piles

Abstract

The invention belongs to retaining and protection of foundation excavation, and discloses a beam-type connecting node for special-shaped double-row piles. The beam-type connecting node comprises a rigid-frame beam, a back-row wall crown beam and structural steel. The structural steel is built in the back-row wall crown beam. The two ends of the rigid-frame beam are connected with a cast-in-place pile of the front-row piles and the structural steel inside the back-row wall. Back-row wall crown beam longitudinal bars inside the back-row wall crown beam are arranged on the two sides of flanges of the structural steel and connected through built-in reinforcing steel bars. The built-in reinforcing steel bars include small stirrups, U-shaped main reinforcing bars and structural steel sleeve stirrups. The small stirrups are bound to the back-row wall crown beam longitudinal bars on the same side of the structural steel, the open ends of the U-shaped main reinforcing bars are anchored into a front-row pile crown beam, the closed ends of the U-shaped reinforcing steel bars are close to the flanges of the structural steel, and the structural steel sleeve stirrups are sleeved with the small stirrups on the two sides of the structural steel and the closed ends of the U-shaped main reinforcing bars. By adopting the beam-type connecting node, the difficult problem that main reinforcing bars inside a rigid-frame beam cannot penetrate through the back-row wall crown beam due to the fact that the structural steel penetrates through the rigid-frame beam can be avoided, and meanwhile the problem that the anti-shearing capacity and the anti-bending bearing capacity of the rigid-frame beam are greatly weakened due to the fact that the structural steel penetrates through the rigid-frame beam can be solved.

Description

technical field [0001] The invention belongs to the field of foundation pit support and slope protection, and in particular relates to a beam-type connection node for special-shaped double-row piles. Background technique [0002] With the rapid development of urbanization and the vigorous promotion of urban integration, the construction of underground facilities such as underground parking lots, underground commercial plazas, and underground railways requires foundation pit support. These foundation pit projects often have the following characteristics: the outer wall of the basement is close to the building planning red line; there are a large number of underground facilities such as existing buildings and pipe networks around the foundation pit; the groundwater level is relatively high. As a result, the traditional foundation pit support technology has the following three serious problems: (1) The traditional soil nail support, composite soil nail support, and pile-anchor ...

AI Technical Summary

Problems solved by technology

The use of this beam-type connection node can not only avoid the problem that the main reinforcement of the rigid frame beam cannot pass through the crown beam of the rear wall due to the section steel penetrating the rigid frame beam, but also solve the problem of the shear bearing capacity and bending resistance of the rigid frame beam caused by the section steel penetrating the rigid frame beam. The problem of greatly weakened bearing capacity

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