Construction process for superlarge-section and large-dip-angle tunnel type pile foundation

Abstract

The invention discloses a construction process for a supperlarge-section and large-dip-angle tunnel type pile foundation. The pile foundation to be constructed is a reinforced concrete pile. A pile hole of the reinforced concrete pile is a superlarge-section large-dip-angle tunnel hole. In construction of the pile foundation to be constructed, the process comprises the steps of firstly, pile hole construction, i.e., 101, advanced pipe shed support construction is conducted at the top of the pile hole, 102, hole mouth protection is conducted and a hole mouth support structure is constructed at a hole mouth of the pile hole, and 103, pile hole excavation construction is conducted, a full section excavation method is adopted for the pile hole excavation with a plurality of construction segments arranged from top to bottom, and a full section support structure is adopted for supporting; and secondly, pile body construction, i.e., the pile body of the reinforced concrete pile is constructed, and the construction process comprises the two steps of reinforcing cage binding and concrete spouting. The construction process for the supperlarge-section and large-dip-angle tunnel type pile foundation is simple in step, reasonable in design, low in investment cost, simple and easy to construct, good in use effect and capable of easily and fast completing 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...

AI Technical Summary

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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