End part thread five-pointed-star-shaped variable-section prefabricated pipe pile and construction method thereof

A technology of prefabricated pipe piles and threads, which is applied in the direction of sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of reducing the safety reserve of pile body strength, uneven subsidence of upper structures, and reducing bearing capacity, etc., to achieve increased The effect of bearing capacity, simple construction, and enhanced stability

Active Publication Date: 2013-12-11
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous promotion and application of pile foundations, researchers have found that the settlement of the soil around the pile will be greater than that of the pile due to self-consolidation, water soaking and subsidence, site filling, ground pile load, pile top load, and groundwater level drop. At this time, the pile side will produce negative frictional resistance, which constitutes a part of the load of the pressure-bearing pile, which reduces the bearing capacity of the pile, reduces the safety reserve of the pile body strength, and may cause a large settlement of the pile body Then it will drive the superstructure to sink unevenly, and even cause foundation damage in severe cases

Method used

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  • End part thread five-pointed-star-shaped variable-section prefabricated pipe pile and construction method thereof
  • End part thread five-pointed-star-shaped variable-section prefabricated pipe pile and construction method thereof
  • End part thread five-pointed-star-shaped variable-section prefabricated pipe pile and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: A prefabricated pipe pile with threaded five-star deformed section at the end of the present invention, its structure is as follows figure 1 As shown, the first pipe section 6 and the second pipe section 7 are included. The structure of the first pipe section 6 is as follows: figure 2 , from bottom to top, there are pile tip 1, large section section 2, ribbed section 3 and top threaded section 5. The large section section 2 is frustum-shaped with threads on the surface. equal, such as image 3 , the surface of the ribbed section has ribs 4; the cross section of the top threaded section 5 is circular.

[0029] Such as Figure 4 , the second pipe joint 7 is in the shape of an inverted truncated cone, the truncated cone has a central through hole 10, the lower section of the central through hole is provided with an internal thread section 9, the surface of the truncated cone is smooth, and a scale line 8 is provided, and the scale line is marked with a br...

Embodiment 2

[0030] Embodiment 2: Apply the construction method of a prefabricated pipe pile with threaded five-star shape at the end provided in Embodiment 1 of the present invention, including the following construction steps:

[0031] (1) Level the site and put the static pressure pile driver 11 in place, such as Figure 5 shown.

[0032] (2) Lifting of prefabricated piles: use a crane 12 to lift the first pipe joint 6 into the pile pressing box 13, so that the pile tip 1 is vertically aligned with the center of the pile position, such as Figure 6 as shown in a.

[0033] (3) Press into the first pipe joint 6: press the first pipe joint 6 into the ground with the pile pressure hydraulic cylinder of the pile pressure box 13 . Such as Figure 6 As shown in b, the pile is clamped by using the force-increasing principle of the wedge splitting of the chuck box, and the pile is pressed into the ground with the pile-pressing hydraulic cylinder. The pile-pressing stroke is 1m each time, and ...

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Abstract

The invention relates to an end part thread five-pointed-star-shaped variable-section prefabricated pipe pile and a construction method of the end part thread five-pointed-star-shaped variable-section prefabricated pipe pile. The pipe pile comprises two pipe sections; a first pipe section is provided with a pile point, a large-section section, a belt rib section and a top thread section; the large-section section is in a frustum shape and the surface is provided with a thread; the cross section of the belt rib section is in a five-pointed star shape and is the same in size; the surface of the belt rib section is provided with a belt rib; the cross section of the top thread section is circular; a second pipe section is in a reversed circular truncated cone shape and a circular truncated cone has a central through hole; the lower section of the central through hole is provided with an inner thread section; the surface of the circular truncated cone is provided with a ruler line and the cross section of the circular truncated cone is annular; and the integrated prefabricated pipe pile is formed by connecting the two pipe sections by screwing the top thread section into the inner thread section. The pipe pile has the advantages of simple structure and low manufacturing cost. The invention further provides the construction method of the pipe pile, and the construction method has the advantages of strong operability, high construction efficiency and good stability and safety of the pipe pile; and the construction method is suitable for the foundation construction of a large-size pile of a soft soil region and has obvious economic benefit.

Description

technical field [0001] The invention relates to a prefabricated pipe pile with threaded five-star variable section at the end and a construction method thereof. The variable section refers to the variable section in the direction of the long axis of the prefabricated pipe pile, which belongs to the technical field of building pile foundations. Background technique [0002] With the continuous expansion of the scale of cities in our country, more and more high-rise buildings are facing the problem of being built on soft soil foundations. Because the pile foundation bears the load of the upper building mainly through the friction resistance of the pile side and the resistance of the pile end, and it has a large integrity and rigidity, it can bear a large vertical load, which makes it a good foundation It meets the bearing capacity requirements and settlement requirements of high-rise buildings, and becomes the main foundation form of high-rise buildings in soft soil areas. Wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/48E02D5/24E02D5/52E02D7/20
Inventor 代先尧李长冬雍睿王凯刘庆涛马俊伟夏浩王姣梁德明
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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