A construction method of cement mixing pile pile group

Abstract

The invention relates to the technical field of pile foundation structure construction methods, in particular to a cement stirring pile group construction method. The construction method is characterized in that a stirring device is used for fully stirring and mixing cement grout and a soft soil layer to form stirring piles, before pile top sections of the stirring piles are initially set, the pile top sections are stirred again, the stirring range of the stirring device is further expanded, the cement grout generated by the pile top sections of the stirring piles, the pile top sections of theadjacent stirring piles before the initial setting state and the soft soil layer between the cement grout and the pile top sections are fully mixed, until the pile top sections of the two stirring piles are staggered and overlapped to form an integral structure which is connected into a whole, and the other stirring piles are constructed in sequence to form a stirring pile group with the pile topstructures completely hooked and connected into a whole. According to the cement stirring pile group construction method, the expanded pile head structure is formed by the cement grout returned during construction of the cement stirring piles, all cement stirring pile bodies are connected into a whole, so that the problem that weaken foundation among the cement stirring pile bodies is prone to generate uneven settlement is solved.

Description

technical field [0001] The invention relates to the technical field of pile foundation structure construction methods, in particular to a construction method for cement mixing pile pile groups. Background technique [0002] In road engineering, it is often encountered that the soft soil foundation needs to be dealt with. Cement mixing pile is a common soft ground treatment method. The principle is to form a suitable foundation by mixing cement piles at a certain distance, and then lay geogrids on the top of the piles to strengthen the integrity of the foundation. [0003] However, the above process has the following disadvantages: 1. Due to the existence of soft soil between the piles and the flexibility of the geogrid, local settlements tend to occur between the piles, especially for subgrades with a small backfill thickness. . 2. During roadbed construction, mechanical equipment can easily damage the geogrid and affect its effectiveness. 3. The cement slurry returned d...

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Problems solved by technology

[0003] However, the above process has the following disadvantages: 1. Due to the existence of soft soil between the piles and the flexibility of the geogrid, local settlements tend to occur between the piles, especially for subgrades with a small backfill thickness.

2. During roadbed construction, mechanical equipment can easily damage the geogrid and affect its effectiveness

3. The cement slurry returned during the construction of cement mixing piles cannot be effectively used, resulting in great waste

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