Method for reinforcing soft soil foundation settlement control pile foundation bracket of high-grade highway in use

Abstract

The invention discloses a method for reinforcing the soft soil foundation settlement control pile foundation bracket of a high-grade highway in use. The method comprises the following technical steps: partitioning the highway segment to be reinforced; constructing a hoard for the first partition; arranging the hole drilling position; drilling holes to the designed depth; ejecting high-pressure cement grout into the drill holes by using a cement-grout ejecting pipe, rotating and pulling to the top surface of a soft soil layer to form high-strength cement-soil piles with variable diameters; filling cement mortar into the drill holes so that the holes in the filling of the embankment are filled with the cement mortar to the bottom surface of the pavement structure layer; filling the drilled holes in the pavement structure layer range with asphalt surface material; repeating the steps until the construction of the whole highway is finished. During the construction of the highway, vehicles can run normally; the hole drilling causes less damage to the pavement structure layer; and the piles fulfill the function of supporting the embankment, so that the post-construction settlement of the subgrade of the highway is reduced greatly. The method provided by the invention adopts simple construction procedures, is convenient to operate, is economical and efficient and has a good implementation effect.

Description

Technical field [0001] The present invention belongs to the field of civil and transportation engineering technology, and is particularly involved in the reinforcement method of the sinking control of high -level high -level highways in active high -level highways. Background technique [0002] my country's highway construction has developed rapidly, and most of my country's highways are located in the eastern coastal areas. The construction of highways in coastal areas has a large number of soft land base treatment.To build a highway in a soft land area, it is necessary to solve the problem of uneven settlement of the roadbed, especially at the location of the bridgehead.my country's "Design Specifications for Highway Roads" (JTG D30-2004) stipulates that the post -working drop in the general road section is less than 30cm. [0003] The highway has high requirements on the foundation, and after completion, it must achieve the service purpose of "fast, safe, economical, and comfo...

AI Technical Summary

Problems solved by technology

[0005] In order to fundamentally solve the problem of existing expressway settlement diseases, it is necessary to re-strengthen the weak soil foundation under the embankment. After all the soil is excavated and then the foundation is reinforced, the project volume is very large, and the construction period is long, which affects the traffic of vehicles

Traditional pile-based composite foundation technology has a better effect in strengthening soft soil foundations, such as prestressed pipe piles, CFG piles, PCC piles, cement-soil mixing piles, gravel piles, etc., but the diameter of traditional pile foundations is relatively large, generally 50cm As mentioned above, pile holes equal to the pile diameter need to be formed in the foundation during construction. If it is used to reinforce the soft soil foundation of the high-grade embankment in active service, the original road surface and embankment structure will be destroyed, and the high-grade embankment structure will need to be re-constructed, increasing the cost. project costs

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