Reinforcement and detection method for old and new roadbed combined part

Abstract

The invention discloses a reinforcement and detection method for an old and new roadbed combined part; an old and new roadbed combined part rolled to be qualified is subjected to continuous tamping reinforcement by a 36-42 kJ high-speed hydraulic rammer compactor point by point successively, the distance between each two tamping point edges is 0-0.5 m, single point is tamped for 5-18 hammers, and the cumulative settlement amount of later 3 hammers is a reinforcing effect detection method. A roadbed soil body which is 2-4 m in thickness can be compressed and enhanced at a time, an uneven soil body after layering rolling is homogenized, the way using the settlement amount of the later 3 hammers for judging the filling building quality is simple and easy to implement, a requirement that post-construction settlement is reduced by improving the strength and uniformity of the roadbed is better met, and hidden defects of earlier-stage construction can be found.

Description

technical field [0001] The invention relates to a method for reinforcing and detecting the junction of old and new roadbeds when roads are widened, in particular to a construction method for eliminating or reducing differential settlement of old and new roadbeds and a method for detecting and judging construction effects. Background technique [0002] After the road has been in operation for a period of time, its side slope is very weak, and the problem of high embankment side slope weakness is more prominent. When the road is widened, steps with a width of more than 1m are generally excavated step by step on the side slope and then filled in layers. The most difficult part is the passage of heavy trucks after the road is opened to traffic. [0003] At present, the junction of old and new roads is reinforced with a 20-ton roller after normal rolling, and then a 32-36-ton vibratory roller or a 10-20-ton dynamic compaction machine is used for reinforcement. The hundreds of me...

AI Technical Summary

Problems solved by technology

[0007] When both sides of low-grade low-fill or excavated roads are widened, one side is less than 2m, and the road roller cannot work normally.

This patent application discloses the method of three-hammer detection, but the disadvantage is that according to the relevant road standards and specifications, different filling stages of the roadbed (such as roadbed, embankment, etc.) joints, etc.) and different grades of roads have different filling quality requirements; different types of tamping machines have different grounding pressures when using different setting parameters, and the reinforcement effects are different when the settlement of the last three hammers is the same (such as cumulative settlement, subgrade strength, etc.)

It is neither scientific nor practical to directly correlate the number of hammer blows with the degree of compaction in the above-mentioned patents and patent applications

Moreover, roadbed reinforcement is the enhanced supplementary pressure implemented on the basis of qualified rolling (reaching the specified degree of compaction), and it solves the problem of excessive post-construction settlement that is unsuitable

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