Self-resetting multidimensional damping pipe pile group foundation and construction method

Abstract

The invention discloses a self-resetting multidimensional damping pipe pile group foundation and a construction method, and belongs to the technical field of building seismic resistance. The foundation comprises a bearing platform, a PHC (prestressed high strength concrete) pipe pile, damping supports and a damping ground anchor, wherein the damping supports are connected between peripheral foundation piles and the bearing platform, and each damping support comprises an upper seal plate, a lower seal plate, a soft steel core rubber pad, radial reset springs, an outer sleeve and an inner sleeve and extends into a groove in the bottom of the bearing platform, and the bottom of each damping support is arranged at the top of the corresponding pile through the corresponding inner sleeve in a sleeving manner for fixing; the damping ground anchor below a central pipe pile comprises a shearing damper and anchor rods, the shearing damper comprises vertical reset springs, soft steel clamps and steel clamping grooves, the ground anchor is used for penetrating into the soil layer at a pile end of the central pipe pile, and the upper end of the ground anchor is anchored on the top surface of the bearing platform through a steel pulling cable. By means of the foundation and the construction method, vibration energy during reciprocating motion of seism is effectively absorbed, the multidimensional damping effect of the pile group foundation is realized, pile-bearing platform joints with ductile energy consumption capacity are formed, and the problem that pipe pile heads are prone to seismic damage under the action of strong seism is solved.

Description

technical field [0001] The invention relates to a self-resetting multi-dimensional shock-absorbing pipe pile group foundation and a construction method, belonging to the field of building anti-seismic technology. Background technique [0002] As one of the important forms of pile foundation, prestressed concrete pipe pile (PHC pipe pile) is widely used in the field of construction engineering in my country. However, due to the hollow structure of PHC pipe piles, their shear and flexural bearing capacity are significantly lower than those of solid piles of the same size, and there are inherent deficiencies in resisting horizontal seismic loads, which seriously reduce the overall seismic performance of the foundation. Therefore, the existing atlas imposes certain restrictions on the application of PHC pipe piles in high-intensity earthquake areas, pointing out that when the seismic fortification intensity is 8 degrees and the construction site category is Ⅲ, Ⅳ, it needs to be ...

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Problems solved by technology

Chinese invention patents "variable stiffness energy-dissipating joint for connecting pipe pile head and cap (201510230232.0)" and "a shock absorbing device and construction method for connecting pile foundation and cap (201610141295.3)" respectively Using butterfly springs and filling buffer materials to achieve elastic rotation or horizontal energy dissipation and shock absorption at the joint between the pile and the cap has certain engineering application value, but there are too many sideways movements of the support under strong earthquakes or insufficient vertical bearing capacity. And other shortcomings, and can not play the role of horizontal and vertical shock absorption at the same time

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