Sectionable steel-concrete combined threaded pile

Abstract

The invention discloses a sectionable steel-concrete combined threaded pile, which belongs to the technical field of constructional engineering equipment and comprises a pile foundation pipe, a plurality of pile section pipes are sequentially connected onto the pile foundation pipe through pile section connecting sleeves, a pile head is arranged at the bottom of the pile foundation pipe, and the top of the uppermost pile section pipe is connected with a pile machine connecting rod through a pile cap connecting sleeve. The pile section pipe and the pile foundation pipe are both in a hollow pipe shape, the side faces of pipe bodies of the pile section pipe and the pile foundation pipe are each provided with a threaded disc and a slurry outlet hole, the threaded discs reduce the pile foundation construction difficulty and can increase the circumferential area, then the frictional resistance between the pile circumference and soil is increased, and the pile foundation bearing capacity is improved; part of concrete grout can be injected into the soil layer around the pile through the grout outlet holes, the pile side resistance is further increased, the bearing capacity of the pile foundation is improved, in addition, the elasticity of the pile is increased through the steel pipe and concrete combined pile, the rigidity is high, the vertical bearing capacity and the transverse bearing capacity of the pile foundation are improved, and the anti-seismic capacity is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering equipment, in particular to a segmentable steel-concrete composite threaded pile. Background Art

[0002] A deep foundation consisting of a pile and a pile cap (referred to as a cap) connected to the top of the pile, or a single pile foundation connected by a column and a pile foundation, is referred to as a pile foundation. If the pile body is completely buried in the soil and the bottom of the cap is in contact with the soil, it is called a low cap pile foundation; if the upper part of the pile body is exposed to the ground and the bottom of the cap is above the ground, it is called a high cap pile foundation. Building pile foundations are usually low cap pile foundations. Pile foundations are widely used in high-rise buildings. Pile foundations are mainly divided into friction piles and end-bearing piles according to their bearing capacity. Friction piles use the friction between the stratum and the foundation piles to carry the structure and can be divided into pressure piles and tension piles. They are generally used in strata without a hard bearing layer or a deep bearing layer. The end-bearing pile system allows the foundation pile to be located on the bearing layer (on the rock bed) so that it can carry the structure. At present, friction piles mainly rely on the side friction resistance of the soil layer around the pile to the pile side wall to provide the compressive and tensile bearing capacity of the pile foundation. The bearing capacity is related to the pile diameter and the mechanical properties of the soil around the pile.

[0003] At present, in order to improve the bearing capacity of pile foundation, the general practice is to increase the pile diameter or increase the pile length, but both have some defects. Increasing the pile diameter or increasing the pile length not only increases the cost budget, but also increases the difficulty of pile foundation construction. In addition, for the construction of large-diameter and long piles, it is difficult to control the quality of the construction pile body for bored cast-in-place piles, and it is difficult to sink precast piles. Summary of the invention

[0004] In order to overcome the defects of increased cost and increased construction difficulty caused by improving the bearing capacity of pile foundation in the prior art, the present invention provides a segmented steel-concrete composite threaded pile.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a segmented steel-concrete composite threaded pile, including a pile foundation pipe, a plurality of pile joint pipes are sequentially connected to the pile foundation pipe through a pile joint connecting sleeve, a pile head is provided at the bottom of the pile foundation pipe, the top of the uppermost pile joint pipe is connected to the pile driver connecting rod through a pile cap connecting sleeve, the pile joint pipe and the pile foundation pipe are both hollow tubes, and the sides of the pipe bodies of the pile joint pipe and the pile foundation pipe are both provided with threaded discs and slurry outlet holes.

[0006] As a further improvement of the present invention, the pile head is a conical head.

[0007] As a further improvement of the present invention, drill teeth are provided on the pile head.

[0008] As a further improvement of the present invention, the threaded disc is a steel spiral thread.

[0009] As a further improvement of the present invention, the threaded disc is welded to the side surfaces of the pipe bodies of the pile joint pipe and the pile foundation pipe.

[0010] As a further improvement of the present invention, the pile head is welded to the steel pipe pile.

[0011] As a further improvement of the present invention, the pile joint connecting sleeve is a symmetrical sleeve internal thread structure.

[0012] As a further improvement of the present invention, the pile cap connecting sleeve comprises an upper plug-in sleeve and a lower threaded sleeve, and a latch assembly is provided on the upper plug-in sleeve.

[0013] It can be seen from the above technical scheme that the beneficial effects of the present invention are: in this scheme, the threaded disc can transform the steel pipe pile construction from static pressure construction to drilling construction, reducing the difficulty of pile foundation construction and accelerating the construction progress. The threaded disc can increase the peripheral area, thereby increasing the friction resistance between the pile and the soil, and increasing the bearing capacity of the pile foundation; slurry holes are set on the side of the pipe body of the pile section pipe and the pile foundation pipe, and the slurry holes can allow a part of the concrete slurry to be injected into the soil layer around the pile, further increasing the pile side resistance and increasing the bearing capacity of the pile foundation. In addition, the steel pipe and concrete combination pile not only increases the elasticity of the pile and reduces the cost, but also has higher rigidity, which improves the vertical and lateral bearing capacity of the pile foundation and further improves the seismic resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0015] Figure 1 The present invention is a structural schematic diagram of a segmented steel-concrete composite threaded pile.

[0016] Figure 2 It is a schematic diagram of the structure of the pile foundation pipe of the present invention.

[0017] Figure 3 It is a structural schematic diagram of the pile joint pipe of the present invention.

[0018] Figure 4 It is a schematic structural diagram of the pile segment connecting sleeve of the present invention.

[0019] Figure 5 It is a schematic structural diagram of the pile cap connecting sleeve of the present invention.

[0020] In the figure: 1. Pile joint pipe; 2. Pile head; 3. Pile joint connecting sleeve; 4. Pile cap connecting sleeve; 41. Upper plug-in sleeve; 42. Lower threaded sleeve; 43. Pin assembly; 5. Pile driver connecting rod; 6. Threaded disc; 7. Slurry outlet hole; 8. Drill bit teeth; 9. Pile foundation pipe. DETAILED DESCRIPTION

[0021] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0022] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention discloses a segmented steel-concrete composite threaded pile, comprising a pile foundation pipe 9, on which a plurality of pile joint pipes 1 are sequentially connected via pile joint connecting sleeves 3, a pile head 2 is provided at the bottom of the pile foundation pipe 9, and the top of the uppermost pile joint pipe 1 is connected to a pile driver connecting rod 5 via a pile cap connecting sleeve 4, the pile joint pipe 1 and the pile foundation pipe 9 are both hollow tubes, and threaded discs 6 and slurry outlet holes 7 are provided on the side surfaces of the pipe bodies of the pile joint pipe 1 and the pile foundation pipe 9.

[0023] The threaded disc 6 is a steel spiral thread, and the threaded disc 6 is welded to the side of the pile section pipe 1 and the pile foundation pipe 9. The threaded disc 6 can transform the steel pipe pile construction from static pressure construction to drilling construction, which reduces the difficulty of pile foundation construction and speeds up the construction progress. The threaded disc 6 can increase the peripheral area, thereby increasing the friction resistance between the pile and the soil, and increasing the bearing capacity of the pile foundation; Reference Figure 4 The pile joint connecting sleeve 3 is a symmetrical sleeve internal thread structure.

[0024] Reference Figure 5 As a further improvement of the present invention, the pile cap connecting sleeve 4 includes an upper plug-in sleeve 41 and a lower threaded sleeve 42 , and a latch assembly 43 is provided on the upper plug-in sleeve 41 .

[0025] A certain number of grouting holes 7 are arranged on the side of the pipe body of the pile joint pipe 1 and the pile foundation pipe 9, and the number of grouting holes 7 should meet the requirements of the tensile or compressive strength of the cross section. The pile head 2 is a conical head. The surface of the pile head 2 is provided with drill teeth 8 for cutting the soil layer, which is convenient for drilling and can increase the pile end resistance during use. The side of the pipe body of the pile joint pipe 1 and the pile foundation pipe 9 are both provided with threaded discs 6, which are steel spiral threads. The pile foundation bearing capacity can be increased during the use stage, and the stability can be enhanced at the same time. The pile foundation can be automatically drilled by a pile driver during the construction stage, which speeds up the construction progress and saves construction costs.

[0026] The pile head 2 is a conical head, and a drill bit 8 is provided on the pile head 2. The pile head 2 is welded to the pile joint pipe 1; the pile head 2 makes pile foundation drilling easier, the pile joint pipe 1 and the pile foundation pipe 9 are connected by the pile joint connecting sleeve 3, the top of the pile foundation pipe 9 and the two ends of the pile joint pipe 1 are respectively external thread structures, the pile joint connecting sleeve 3 is a symmetrical sleeve internal thread structure, the pile joint pipe 1 and the pile foundation pipe 9 are both hollow tubular, the top of the uppermost pile joint pipe 1 is connected to the pile driver connecting rod 5 through the pile cap connecting sleeve 4, the lower part of the pile cap connecting sleeve 4 is a sleeve internal thread structure, and is threadedly connected to the top of the uppermost pile joint pipe 1, the upper part of the pile cap connecting sleeve 4 is a sleeve plug-in structure, and is sleeved with the pile driver connecting rod 5, and the sleeve is fixed by a latch assembly 43, and the latch assembly 43 is made of steel.

[0027] The pile foundation pipe 9 with the pile head 2 is connected to the pile driver connecting rod 5 through the pile cap connecting sleeve 4. The pile driver provides rotational power to cause the pile foundation pipe 9 to rotate into the soil. Then, the pile segment connecting sleeve 3 is mechanically inserted into the top of the pile foundation pipe 9 that has been inserted into the soil. A section of standard pile segment pipe 1 is taken and installed on the pile segment connecting sleeve 3. The pile segment pipe 1 is threadedly connected to the pile cap connecting sleeve 4. Then, the pile cap connecting sleeve 4 is connected through the pile driver connecting rod 5. The drill rod is rotated to connect the upper pile segment pipe 1 to the pile foundation pipe 9 that has been drilled into the ground. The rotation is continued to drill the newly connected pile segment pipe 1 into the underground soil layer. The operation is repeated to connect multiple pile segment pipes 1 until the designed pile length is reached. Finally, high-pressure concrete slurry is injected into the pile segment pipe 1 and the pile foundation pipe 9 through the grouting machine. Part of the slurry is sprayed to the surrounding soil layer through the slurry outlet 7 to increase the pile side resistance. The grouting is stopped after the slurry fills the pile segment pipe 1 and the pile foundation pipe 9, and the steel-concrete combination assembly is completed.

[0028] The slurry outlet holes 7 are arranged on the side of the pipe bodies of the pile section pipe 1 and the pile foundation pipe 9. The slurry outlet holes 7 allow a portion of the concrete slurry to be injected into the soil layer around the pile, further increasing the pile side resistance and the bearing capacity of the pile foundation. In addition, the steel pipe and concrete composite pile not only increases the elasticity of the pile, but also has higher rigidity, thereby improving the vertical and lateral bearing capacity of the pile foundation and further improving the earthquake resistance.

[0029] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A segmentable steel-concrete composite threaded pile, characterized in that: The invention comprises a pile foundation pipe (9), a plurality of pile joint pipes (1) are sequentially connected to the pile foundation pipe (9) via pile joint connecting sleeves (3), a pile head (2) is provided at the bottom of the pile foundation pipe (9), the top of the uppermost pile joint pipe (1) is connected to a pile driver connecting rod (5) via a pile cap connecting sleeve (4), the pile joint pipe (1) and the pile foundation pipe (9) are both hollow tubes, and the sides of the pipe bodies of the pile joint pipe (1) and the pile foundation pipe (9) are both provided with threaded discs (6) and slurry outlet holes (7).

2. The segmentable steel-concrete composite threaded pile according to claim 1, characterized in that: The pile head (2) is a conical head.

3. The segmentable steel-concrete composite threaded pile according to claim 2 is characterized in that: The pile head (2) is provided with drill teeth (8).

4. The segmentable steel-concrete composite threaded pile according to claim 3 is characterized by: The threaded disc (6) is a steel spiral thread.

5. The segmentable steel-concrete composite threaded pile according to claim 4 is characterized in that: The threaded disc (6) is welded to the side surfaces of the pile joint pipe (1) and the pile foundation pipe (9).

6. The segmentable steel-concrete composite threaded pile according to claim 5, characterized in that: The pile head (2) is welded to the pile joint pipe (1).

7. The segmentable steel-concrete composite threaded pile according to claim 6, characterized in that: The pile joint connecting sleeve (3) is a symmetrical sleeve internal thread structure.

8. The segmentable steel-concrete composite threaded pile according to claim 7 is characterized in that: The pile cap connection sleeve (4) comprises an upper plug-in sleeve (41) and a lower threaded sleeve (42), and a latch assembly (43) is provided on the upper plug-in sleeve (41).

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