Combined pile section with reinfored horizontal bending strength and rigidity and its construction method

Abstract

The present invention discloses combined pile section with reinforced horizontal bending strength and rigidity and its construction method. Within certain length range with heavy horizontal load, the pile body is coated with one large size and high strength reinforcing member and structural filling material is then used to combine the pile section and the coating into one integral. The construction process includes the steps of inserting one large sized sleeve, which may be a prefabricated reinforced concrete tubular pile, permanent steel tube and other protecting tube with steel bar cage; constructing the base pile inside the protecting tube, filling structural stuffing in the reinforcing section; and constructing pile head based on the design. The said combined pile has greatly raised horizontal bearing capacity and rigid.

Description

technical field [0001] The invention relates to a pile foundation as a building or structure, in particular to a partially reinforced structure attached to the upper periphery of the pile body and its construction method, which can effectively strengthen the horizontal bending strength and rigidity of the pile foundation. Background technique [0002] With the increasing height of buildings, the application of pile foundation is increasing year by year in terms of quantity, type and scope. It is not only used to transmit huge vertical load to the depth but also to spread the horizontal force to the distance. These horizontal forces include wind load, horizontal earth pressure, horizontal earthquake load, impact load, water flow impact, horizontal force caused by temperature deformation, etc. The types of horizontal loads and the importance engineers attach to them are no less than vertical loads. But except for earth pressure, most of their characteristics are short-term act...

AI Technical Summary

Problems solved by technology

This method seems to be able to solve the above problems on the surface, but the strength-to-stiffness ratio of these newly added H-shaped steel piles is unreasonable, and the stiffness in the two directions is very different, which brings many difficulties to the design

On the one hand, it is difficult to make full use of the strength of these shear steel piles; on the other hand, in the presence of negative friction, they will be pulled down by the surrounding subsiding soil layer, which inadvertently increases the vertical load of the engineering piles

The most unfavorable thing is that the piles are crowded in the narrow construction site, the horizontal thrust generated by each pile in the soil layer is superimposed, and the pile head displacement increases, etc., thus falling into the dilemma of focusing on one thing and losing another

[0006] The second is to adopt the method of paired inclined piles. Since it is impossible to make inclined piles with a large inclination, more inclined piles must be sacrificed to bear the horizontal force. This shows that this method still has a fly in the ointment

Other disadvantages are that the length of the whole pile is increased, the occupied area is increased (sometimes it often exceeds the scope of its own site), the inclination angle and direction are difficult to control, and when the soil around the pile is consolidated and settled, the influence of negative friction on the inclined pile It is even more difficult to evaluate, and the number of load tests for inclined piles may need to be increased, so the economic performance is not ideal

And it's not available everywhere

[0007] The third is to increase the diameter of the whole pile. For example, in the Chinese Patent Application No. 99117810.6, the use of a corrugated pipe mold in a temporary casing is used as a permanent casing. Although it indirectly has the effect of increasing the horizontal resistance and is poured into a large-diameter hole in Hong Kong The pile has been successfully used for more than ten years, but because its starting point is only to protect the concrete of the pile body, its own strength and stiffness are generally not considered because it is difficult to quantitatively analyze, and it must extend to the rock surface. Occupies a pile diameter several times larger than a smooth surface sleeve, so still does not minimize cost

In terms of construction, when the diameter of the pile body is large and the burial is deep, the corrugated casing is prone to bending deformation and squeezes the temporary casing, resulting in the lifting of the corrugated casing when the temporary casing is pulled out, which is likely to cause damage to the project. ACCIDENT

So it is not suitable for pile types other than large diameter bored piles

Moreover, large-diameter bored piles currently have the highest price bearing capacity ratio, expensive construction machinery, and high construction technology requirements. Generally, small and medium-sized construction companies cannot undertake the construction tasks of such pile foundations.

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