Construction method of bamboo wood reinforcement bidirectional enhanced part-cut and part-fill weak roadbed

Abstract

The invention discloses a construction method of a bamboo wood reinforcement bidirectional enhanced part-cut and part-fill weak roadbed, comprising the following steps of: (1) machining a bamboo wood; processing a bamboo sheet; and manufacturing a bamboo rib cage, a bamboo rib grid and a bamboo rib U-shaped anchor nail; (2) flattening a field and setting out a pile position; (3) utilizing a vibration shock method of a vibration immersed tube method to construct to form a bamboo rib cage crushed stone pile and paving a crushed stone cushion layer on a pile top; and (4) digging a step; paving, connecting and anchoring the bamboo rib grid; and backfilling a soil material and rolling and leveling. The construction method is characterized in that the bamboo rib cage can effectively improve the bearing capability and the stability of the crushed stone pile; the bamboo rib grid can reinforce the connection between a filling region and a digging region, the differential deposition is reduced, and sliding and instability of sliding along a filling and digging connecting face is prevented; and the construction method has the beneficial effects that a bamboo rib is used as a reinforcement material so that a construction industry is developed towards a low-carbon, energy-saving, environment-friendly and sustainable development direction, and saves the investment under the condition of meeting the requirements of roadbed bearing capability and deformation stability.

Description

technical field [0001] The invention relates to a roadbed treatment construction method, in particular to a construction method for bamboo reinforced bidirectionally reinforced half-filled and half-dug weak roadbeds in mountain road construction and old road reconstruction projects. Background technique [0002] In recent years, in the process of road construction and old road reconstruction in mountainous areas, the problem of half-filled and half-dug subgrades has been frequently encountered. Since one side of the half-filled and half-excavated subgrade is the original subgrade, and the other side is formed by filling, there is a natural filling-cut interface 3 between the excavation area 1 and the filling area 2 of the subgrade. Differences in the generation method, physical and mechanical properties, groundwater and internal structure of the subgrade often lead to the subgrade slope sliding along the interface, sideways movement or differential settlement of the road sur...

AI Technical Summary

Problems solved by technology

Since one side of the half-filled and half-excavated subgrade is the original subgrade, and the other side is formed by filling, there is a natural filling-cut interface 3 between the excavation area 1 and the filling area 2 of the subgrade. Differences in the generation method, physical and mechanical properties, groundwater and internal structure of the subgrade often lead to the subgrade slope sliding along the interface, sideways movement or differential settlement of the road surface along the interface, resulting in cracking of the road surface; and in the construction of half-filled and half-dug subgrades In the process, we often encounter the situation that the filling area is a weak soil foundation, and the weak soil foundation will also cause differential settlement of the subgrade in the filling area and the subgrade in the excavation area, thereby causing damage to the pavement structure, which has become a difficult engineering problem to solve

[0003] For the reinforcement of the filling-excavation interface 3, the traditional treatment method is to use geosynthetics as reinforcement. Geosynthetics can improve the stability of the filling-excavation interface 3 and reduce differential settlement. However, geosynthetics are composed of coal, oil, and natural gas. It is made of refined chemical substances, and its production requires a large amount of energy. At the same time, it will generate a large amount of waste residue, waste water and waste gas, which will lead to energy consumption and environmental pollution. Today, when we are vigorously promoting sustainable development, we need to find a A kind of energy-saving, environmental protection, low-carbon materials instead; in addition, the construction cost of geosynthetic materials is relatively high

[0004] For the anchoring of reinforced materials and the binding of superimposed parts, steel U-shaped anchors and steel wires are often used in traditional construction, but the use of steel in roadbed construction mainly has the following three disadvantages: 1. Steel is easy to rust in a humid environment; 2. 1. Pollution of the environment; 3. Higher cost

The first type of method is easy to construct, the cost is low, and the strength of the foundation soil will gradually increase with the discharge of water, but the construction period is longer; the second type of method can be applied to all kinds of soft soil foundation reinforcement, but the cost is relatively high; the third type This type of method is easy to construct and low in cost. However, due to the low rigidity and strength of the pile itself, it needs to be surrounded by the surrounding soil to form a pile. When the surrounding soil is weak, the pile within 2 to 4 meters from the pile top is prone to Radial deformation causes bulging and shear failure, and the reinforcement effect is limited

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