Rotating extrusion concrete filling pile construction method and equipment

Abstract

A rotating squeezing concrete filling pile construction method, uses boring tool solid boring with olive type solid borer to drill, rotatably squeezes the soil body to form a solid boring whose surroundings soil body is pressed to the designed deepness, and then reversely turning and lifting the drill stem, meanwhile pumping ultra-fluid state concrete in the hollow-drill stem, vibratedly inserting the drill stem in a reinforcing steel cage after lifting out the drill stem. Boreholes are formed by using olive type solid borer to rotating squeeze the soil body, which does not need to take out earth, has a favorable pressing dense function to surroundings soil body, and rotatably squeezes the concrete filling pile borehole as an once creating pore. Adopting the inventive rotatably squeezing dense soil body pore-creating method, the pile surroundings soil body is stabilized by densification, the compactness of the pile surroundings soil body is improved about 30%, the pile side friction resistance is improved about 30%, the pile end support force is improved about 50-70%; the unconsolidated formation concrete filling coefficient is only 1.25, the construction cost is reduced, which has good pile-formation effect and can improve work efficiency for about 20-30%; the method is suitable for hard and compact clay layer, soil layer containing larger gravel amount and air slaking pulverize rock bedding, meanwhile has economy and environment protection effect; the invention has advantages of simple structure, low fabrication cost, being apt to popularize and spread, and being widely used in concrete filling pile construction.

Description

Technical field: [0001] The invention relates to a construction method and equipment for building pile foundations. Background technique: [0002] At present, long helical pumping superfluid concrete pouring piles are often used in the foundation treatment of high-rise buildings. The main problems of this method are: 1. The soil piles are obtained by auger drilling, which has no compaction effect on the soil between the piles, and has no effect on the following The friction-based composite foundation cannot give full play to the pile strength effect. 2. Restricted by the technology of construction machines and tools, the application range of the formation is relatively small, only suitable for soft clay, clay and silty sand formations, not suitable for soil layers with high gravel content, and the strength is 180-220KN / m 2 Above clay layer and weathered broken rock layer. 3. The long auger drill rod rotates continuously in the hole, the diameter of the loose ground is larg...

AI Technical Summary

Problems solved by technology

[0002] At present, long helical pumping superfluid concrete pouring piles are often used in the foundation treatment of high-rise buildings. The main problems of this method are: 1. The soil piles are obtained by auger drilling, which has no compaction effect on the soil between the piles, and has no effect on the following The friction-based composite foundation cannot give full play to the strength effect of the pile body

2. Restricted by the technology of construction machines and tools, the application range of the formation is relatively small, only suitable for soft clay, clay and silty sand formations, not suitable for soil layers with high gravel content, and the strength is 180-220KN / m 2 Above the clay layer and weathered and broken rock layer

3. The long auger drill pipe rotates continuously in the hole, the diameter of the loose ground is larger, the concrete filling coefficient is 1.5, the waste of concrete is large, and the construction cost is high

4. The long auger drill rod rotates continuously and rubs against the hole wall, resulting in high power consumption and low construction efficiency

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