High-density polymer grouting reinforcement method for roadbed at sinking position of bridge and culvert butt strap

Abstract

The invention discloses a high-density polymer grouting reinforcement method for a roadbed at the sinking position of a bridge and culvert butt strap. The method comprises the following steps that S1, grouting holes are formed; S2, drilling is conducted, specifically, a hollow drill is used for drilling to penetrate through a cement panel and a pavement base layer; S3, grouting pipes are placed; S4, grouting is conducted, specifically, the grouting sequence is from outside to inside, a high-density polymer liquid material conducts grouting on the peripheral grouting holes firstly, then conducts grouting on the inner peripheral grouting holes and finally conducts grouting on the inner center grouting holes; S5, the grouting process is monitored; S6, the grouting holes are closed; and S7, the environment is cleaned. According to the high-density polymer grouting reinforcement method for the roadbed at the sinking position of the bridge and culvert butt strap, the pavement base layer is maintained and the roadbed is reinforced by injecting the double-component high-density polymer liquid material, the injected high-density polymer liquid rapidly generates a chemical reaction to form a solid, the solid rapidly expands with the same volume to fill gaps in a pavement structure, and controllable pressure is applied to surrounding media to compact the roadbed.

Description

technical field [0001] The invention belongs to the technical field of road construction, and in particular relates to a high-density polymer grouting reinforcement method for subgrades at subsidence of bridge and culvert slabs. Background technique [0002] As the mileage of highway construction in my country increases year by year, highway maintenance and reconstruction will become one of the important tasks of the highway construction industry. As of the end of 2017, the mileage of expressways in my country has reached 136,500 kilometers, which means that the national expressway network structure is gradually taking shape. Therefore, expressway construction is expected to enter a relatively stable period in the next five or six years, and road maintenance and reconstruction work will become One of the important tasks of the road construction industry. Taking preventive maintenance measures on the pavement can prevent and inhibit the development of potential diseases on th...

AI Technical Summary

Problems solved by technology

[0003] At present, there is a common problem in high-grade highways: with the increase of the traffic period, different degrees of settlement fractures appear in the backfill of the bridge head and abutment back (the settlement value is generally 10-30cm, and some even exceed 60cm).

At present, domestic and foreign scholars mainly study the rheological characteristics and diffusion mechanism of chemical grout materials by referring to the grouting theory of cement grouting materials and combining the experimental simulation method. The research results are mainly reflected in sandy soil layers, rock masses and embankments. In engineering geology, etc., it involves the theory of seepage grouting and splitting grouting, but there is no further research on the grouting mechanism analysis of high polymer slurry materials in the repair of structural layers such as roadbed and pavement

Images