Construction Technology of Tunnel Type Pile Foundation with Super Large Section and Large Dip Angle

Abstract

The invention discloses a construction technology of super large section and large inclination tunnel type pile foundation. The pile foundation to be constructed is a reinforced concrete pile, and the pile hole of the reinforced concrete pile is a super large section and large inclination angle tunnel hole; when constructing the constructed pile foundation, the steps include: : One, pile hole construction, process is as follows: 101, pipe shed advance support construction: carry out pipe shed advance support construction to pile hole top; Hole excavation construction: adopt the full-section excavation method to excavate the pile hole in multiple construction sections from top to bottom, and use the full-section support structure for support; 2. Pile body construction: the reinforcement of reinforced concrete piles The construction of the pile body includes two steps of steel cage binding and concrete pouring. The invention has the advantages of simple process steps, reasonable design, low investment cost, simple construction, good use effect, simple and rapid completion of the construction process of the tunnel type pile foundation, and the construction process is easy to control.

Description

technical field [0001] The invention belongs to the technical field of pile foundation construction, and in particular relates to a super-large-section and large-inclination-angle tunnel-type pile foundation construction technology. Background technique [0002] At present, during the construction of bridge pile foundations, the excavated cross-sectional area is greater than 100m 2 And when the pile foundation with an inclination angle (that is, the angle with the horizontal plane) greater than 45° is constructed, there is no set of mature construction methods to follow. Since the pile hole of the above-mentioned pile foundation is similar to the tunnel hole of a super-large-section and high-inclination tunnel, the pile foundation is called a super-large-section and high-inclination tunnel pile foundation, or tunnel pile foundation for short. Nowadays, the excavation cross-sectional area is greater than 100m 2 And when the super-large cross-section and high-inclination tun...

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Problems solved by technology

However, the above-mentioned excavation method has the following defects and deficiencies in the following three aspects: ① When excavating sections and steps, the safety of excavation is improved by reducing the construction space and increasing the support in the body, but the space is so small that it is impossible to use machinery. Coordination and low degree of mechanization have greatly reduced the construction progress and brought difficulties to the construction; ②The support process is complicated, and the use of manual installation of the support structure greatly reduces the construction efficiency, and it is impossible to monitor the changes of surrounding rocks in real time, and the construction safety risk is great ;③ Due to the large inclination angle of the foundation, large-scale machinery cannot enter and exit the foundation by itself, and the muck or ballast cannot be removed by rail transportation, and the construction efficiency is extremely low

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