Horizontal reinforced concrete steel pipe pile pre-supporting and protecting method

Abstract

The invention discloses a horizontal reinforced concrete steel pipe pile pre-supporting and protecting method. The method includes the following steps that 1, multiple steel pipe piles are jacked in along a pre-designed outer contour line of an oversized box culvert; 2, after the steel pipe piles penetrate through a roadbed, steel reinforcement cages are placed in the steel pipe piles, and concrete is poured; 3, every two adjacent steel pipe piles are meshed with each other to form a rigid rectangular shed along the outer contour line of the oversized box culvert; 4, construction of the oversized box culvert is carried out. The structural safety performance and durability of the steep pipe piles which penetrate downwards through the box culvert and upwards cross a high speed road are improved, and the method is suitable for supporting and protection of homogeneous waterless roadbed soil layers with long distances, large sections and ultra-thin coverage.

Description

technical field [0001] The invention relates to a pre-supporting method, in particular to a pre-supporting method for horizontal reinforced concrete steel pipe piles. Background technique [0002] With the continuous development of cities and road construction, it has gradually formed a consensus in the field of engineering construction technology to carry out underpass construction in existing buildings and roads to reduce the impact on the surrounding environment; Dedicated to solving technical problems. [0003] At present, domestic shallow buried and underground excavation formation stabilization measures mainly include: advanced bolt support, advanced small conduit pre-grouting support, advanced pipe shed support, advanced pre-grouting, ground mortar anchor, surface grouting, etc.; The outer diameter of the shed supporting steel pipe should be φ (70-180) mm, and the hole depth should not exceed 10m; The smaller the better, the smaller the better, and the steel pipes o...

AI Technical Summary

Problems solved by technology

[0004] A super-large box culvert with a box chamber of 16m×8.5m is added below 1m of the existing expressway road surface, and zero settlement is required to maintain the operation of the expressway. Effective pre-support methods must be adopted during construction to reduce the impact of underpassing box culvert construction on existing roads However, none of the existing advanced pre-support technologies can meet the construction requirements; surface mortar bolts and surface grouting methods affect the passage of road vehicles, and in the process of underground excavation, the strength and stiffness are not enough to easily crack settlement; It is not applicable for medium, advanced pre-grouting and advanced small pipe pre-grouting support, because the covering layer of the culvert roof is only 1m cover weight, it is not suitable to adopt advanced grouting, and this method is not suitable for 16m wide section; And grouting is not suitable for use, and the strength and rigidity in the 16m wide section do not meet the requirements

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