A construction method of high-speed railway catenary pillar foundation structure

Abstract

The invention discloses a construction method for a catenary pillar foundation structure of a high-speed railway, which is suitable for the construction of all types of filled roadbeds, and the construction is convenient and efficient. It includes the following steps: fill the subgrade filling body in layers to the bottom elevation of the catenary pillar foundation; ② continue to fill the subgrade filling body and subgrade surface structure in layers, and fill with seepage filler at the corresponding position of the catenary pillar foundation Form the water seepage filling body; ③ Lay a layer of composite geomembrane on the top of the water seepage filling body; ④ Fill the remaining subgrade surface structure; Drilling bolts are used for pressure grouting to form a high-strength composite cement mortar body with steel bars; ⑦ Excavate the subgrade surface structure above the top surface of the high-strength steel bar composite cement mortar body; ⑧ Bind the reinforcement cage in the shallow foundation pit, and The tops of the exposed drilled anchors are fixedly connected; ⑨Concrete is poured in the shallow foundation pit to form a reinforced concrete base.

Description

technical field [0001] The invention relates to railway engineering, in particular to a construction method for a high-speed railway catenary pillar foundation structure. Background technique [0002] The catenary pillar foundation set on the railway embankment is usually excavated by rotary drilling rig or manual digging after the foundation filling of the roadbed is completed, and then reinforced concrete is poured into the foundation pit. There are following problems in this construction method: [0003] (1) It is difficult and inefficient to excavate a small-diameter foundation pit with a depth of 2-3m after subgrade filling; [0004] (2) The excavation of the foundation pit affects the compactness of the filled subgrade, and has a greater impact on the high-speed railway; [0005] (3) When the filling roadbed is provided with a waterproof and drainage geotechnical material layer, the excavation will easily damage the waterproof and drainage geotechnical material, whic...

AI Technical Summary

Problems solved by technology

[0003] (1) It is difficult and inefficient to excavate a small-diameter foundation pit with a depth of 2-3m after subgrade filling;

[0004] (2) The excavation of the foundation pit affects the compactness of the filled subgrade, and has a greater impact on the high-speed railway;

[0005] (3) When the filling roadbed is provided with a waterproof and drainage geotechnical material layer, the excavation will easily damage the waterproof and drainage geotechnical material, which will affect the waterproof and drainage effect of the roadbed;

[0006] (4) Excavation and filling of foundation pits, resulting in waste of materials and great environmental pollution during excavation

[0009] The above-mentioned utility model patents all have certain restrictions on use conditions, and no suitable construction method has been proposed. Therefore, further improvements are needed to propose a contactor that is suitable for all filling subgrades, convenient and efficient construction, and less excavation of foundation pits. The construction method of net pillar foundation is of great significance

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