Small tubular pile reinforcement system for weak base of tunnel and method for constructing small tubular pile reinforcement system

Abstract

The invention relates to a small tubular pile reinforcement system for a weak base of a tunnel and a method for constructing the small tubular pile reinforcement system. Foundations of a tunnel portal at a bridge and tunnel joint directly extend into terrains such as deep valleys in a direct transition manner, the terrains correspond to a bridge, and treatment on the foundations of the soft base at the bridge and tunnel joint has important significance on the stability of integral construction structures at a bridge and tunnel transition position. The small tubular pile reinforcement system is characterized in that a concrete supporting plate is arranged below a tunnel inverted arch structure of the tunnel portal at the bridge and tunnel joint, and steel tubular piles which are arrayed are arranged in the foundations below the concrete supporting plate; the depths of the steel tubular piles are gradually inwardly reduced from the portal, and the steel tubular piles are stepped along the directions of lines and are arranged are arranged in a quincuncial manner in planes. The small tubular pile reinforcement system and the method have the advantages that the small tubular pile reinforcement system is large in foundation treatment depth and small in treatment area, the bearing capacity of the weak foundations can be obviously improved after the small tubular pile reinforcement system is constructed, settlement and deformation of the foundations can be controlled, and normal use of the structures can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of tunnel traffic construction, in particular to a small pipe pile reinforcement system for weak bases of tunnels and a construction method thereof. Background technique [0002] Tunnel engineering, especially the entrance section, often encounters soil strata, such as collapsible loess, clay, etc., which are characterized by relatively low bearing capacity and are prone to settlement. At the same time, the site at the tunnel entrance is generally small and cannot carry out large-scale foundation reinforcement treatment , not handled well, will seriously affect the safety of the superstructure, and will have a greater impact on the stability of the overall structural structure of the transitional section connecting the bridge and tunnel in mountainous areas, causing diseases during the operation period. [0003] In the construction of tunnel engineering in weak ground, due to insufficient foundation bearing ...

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Problems solved by technology

[0002] Tunnel engineering, especially the entrance section, often encounters soil strata, such as collapsible loess, clay, etc., which are characterized by relatively low bearing capacity and are prone to settlement. At the same time, the site at the tunnel entrance is generally small and cannot carry out large-scale foundation reinforcement treatment , the handling is not good, which seriously affects the safety of the upper structure, and has a greater impact on the stability of the overall structure of the transitional section connecting the bridge and tunnel in the mountainous area, causing diseases during the operation period

[0003] In the construction of tunnel engineering in weak ground, due to insufficient bearing capacity of the foundation, the tunnel will be unstable and deformed, and the settlement will be large, which will seriously affect the safety of tunnel construction and operation.

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