Vibratory pile hammer for cast-in-situ bellout wedge-shaped reinforced concrete pile and construction method

Abstract

A vibratory pile hammer for a cast-in-situ bellout wedge-shaped reinforced concrete pile and a construction method belong to the technical field of construction pile foundations. The lower part of a vibratory head of the vibratory pile hammer is jointed with the upper part of a wedge-shaped steel sleeve by a steel cover plate with a round hole. The lower end of the wedge-shaped steel sleeve is connected with a valve pile shoe. The vibratory head is started to downwardly drive the wedge-shaped steel sleeve and the valve pile shoe to be hammered into a foundation. A dry and hard concrete solid filler is filled into the inner cavity of the wedge-shaped steel sleeve through a feeding port. An expanded head is formed by tamping and hammering. A steel reinforcement cage is lowered down. Concreteis cast. The vibratory head vibrates to drive the wedge-shaped steel sleeve to be pulled out upwardly so as to form a wedge-shaped pile body and then finally form the bellout wedge-shaped reinforcedconcrete pile. Compared with existing shaped piles with uniform sections, the pile saves the concrete and improves the pile-side positive frictional resistance, and the expanded head of the pile effectively improves the resistance value at a pile end and can effectively reduce the influence brought by negative frictional resistance to the pile body. The processing depth of the vibratory pile hammer can be up to approximately 30m, the process of the vibratory pile hammer is simple, highly efficient and strongly operable, facilitates control and detection and has high single pile bearing capacity.

Description

technical field [0001] The invention belongs to the technical field of building pile foundations, and relates to a construction method of a cast-in-place wedge-shaped reinforced concrete pile with an enlarged bottom. Background technique [0002] The vertical bearing capacity of pile foundation is composed of two parts: pile side friction resistance and pile tip resistance. Traditional equal-section piles have the disadvantages of low utilization rate of unit material strength, and the pile body is significantly affected by pile side negative friction resistance; wedge-shaped piles and expanded bottom piles can effectively improve the utilization rate of unit material strength by changing the longitudinal section form of the pile body. Before the present invention, wedge-shaped piles, such as the Chinese patent prestressed conical pile (ZL200420063381.x), etc., use the inclined surface of the inverted cone to convert part of the vertical downward force into a horizontal forc...

AI Technical Summary

Problems solved by technology

Traditional equal-section piles have the disadvantages of low unit material strength utilization rate, and the pile body is significantly affected by pile side negative friction resistance; wedge-shaped piles, expanded bottom piles, etc. can effectively improve the unit material strength utilization rate by changing the longitudinal section form of the pile body

Before the present invention, wedge-shaped piles, such as the Chinese patent prestressed conical pipe pile (ZL200420063381.x), etc., use the inclined surface of the inverted cone to convert part of the vertical downward force into a horizontal force, and fully exert the bearing capacity of the soil on the side of the pile. , so as to improve the pile side friction resistance; compared with equal cross-section piles, it has the advantages of better soil penetration and higher pile unit bearing capacity; however, due to the small cross-sectional area of ​​the pile bottom, the pile end Resistance play is limited

Bottom expansion piles, such as Chinese patents ZL200410102711.6 and ZL200510009681.9, etc., are on the basis of traditional equal-section piles, and the bottom of the pile is enlarged to increase the cross-sectional area of ​​the pile end, thereby improving the resistance value of the pile end; but this method There is no improvement in the improvement of the pile side friction resistance, and it is easy to be affected by the pile side negative friction resistance and reduce the overall bearing capacity of the pile foundation

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