Pile tip constraint high-pressure jet grouting center tunneling pile sinking device

Abstract

The invention discloses a pile tip constraint high-pressure jet grouting center tunneling pile sinking device which comprises a hollow pile body, a hollow cavity is formed in the hollow pile body, a pile tip steel plate is arranged on the periphery of the bottom of the hollow pile body, and a tunneling mechanism used for cutting and stirring a soil body is arranged in the pile tip steel plate. A slurry pipe is arranged at the top of the hollow pile body, the other end of the slurry pipe is connected with a slurry pump used for pumping slurry in the hollow pile body, a pile tip steel plate with the same outer contour as the precast pile is inserted into a soil body, and high-pressure water rotates automatically through a rotary spray head or a power head drives a hollow drill rod to rotate. Or the annular slurry distribution pipe is used for fixedly spraying, cutting and stirring the soil body in the range of the pile tip steel plate, and discharging the soil body from the pile top connecting slurry pump under the action of water pressure, so that the end bearing force caused by the pile tip soil plug effect can be eliminated, and the precast pile can smoothly sink in a top pressing or holding pressing manner.

Description

Technical Field

[0001] The invention relates to the field of pile driving, and in particular to a pile tip restrained high-pressure rotary grouting central excavation pile driving device. Background Art

[0002] In the traditional central excavation pile driving process, the drilling rig needs a larger pile inner hole diameter, and generally can only be used for large-diameter pipe piles with an inner diameter greater than 340 (600 (110) or more pipe piles). In order to ensure smooth pile driving, it is necessary to use an advance drill deeper than the pile tip to avoid the formation of soil plugs at the pile tip. The advance drill is not only complex in equipment, but also difficult to construct core concrete. The disturbance of the soil at the pile tip will reduce the end bearing capacity of the pile. Based on this, the present invention proposes a pile tip constrained high-pressure rotary grouting central excavation pile driving device to solve the above problems. Summary of the invention

[0003] In order to overcome the defects in the above-mentioned prior art, the present invention provides a pile tip constrained high-pressure rotary jet central excavation pile driving device, which adopts a pile tip steel plate with the same outer contour as the precast pile to be inserted into the soil. High-pressure water is driven by the self-spin of the rotary nozzle or the rotation of the hollow drill rod driven by the power head, or is fixedly sprayed through an annular slurry distribution pipe to cut and stir the soil within the range of the pile tip steel plate, and under the action of water pressure, the slurry is discharged from the top of the pile by a mud pump, which can eliminate the end bearing force caused by the soil plug effect of the pile tip, so that the precast pile can sink smoothly by top pressure or holding pressure.

[0004] Technical Solution

[0005] A pile tip constrained high-pressure rotary grouting central excavation pile driving device comprises a hollow pile body, a hollow cavity is arranged inside the hollow pile body, pile tip steel plates are arranged around the bottom of the hollow pile body, an excavation mechanism for cutting and stirring the soil is arranged inside the pile tip steel plate, a mud pipe is arranged on the top of the hollow pile body, the other end of the mud pipe is connected to a mud pump for extracting mud from the hollow pile body, and a power mechanism for providing power to the excavation mechanism is also arranged on the upper side of the hollow pile body.

[0006] Furthermore, the excavation mechanism includes a bearing bracket fixed in the pile tip steel plate, a hollow bearing is installed on the bearing bracket, a grouting pipe is connected to the upper side of the hollow bearing, and a rotating nozzle is connected to the lower side of the hollow bearing.

[0007] Furthermore, a first nozzle is symmetrically arranged inside the rotating nozzle.

[0008] Furthermore, the power mechanism includes a pipe joint fixedly arranged at the upper end of the grouting pipe, and the other end of the pipe joint is connected to a first supply pipe for providing high-pressure water and high-pressure cement slurry.

[0009] In another embodiment, the excavation mechanism includes a hollow drill rod located inside the hollow cavity, and a second nozzle is provided at the lower end of the hollow drill rod.

[0010] Furthermore, the power mechanism includes a drill rod joint connected to the upper end of the hollow drill rod, the upper end of the drill rod joint is connected to a second supply pipe, and the second supply pipe is provided with a power head for driving the second supply pipe and the hollow drill rod to rotate.

[0011] In another embodiment, the excavation mechanism includes an annular slurry distribution pipe connected to the lower end of the grouting pipe, and the lower side of the annular slurry distribution pipe is connected to a plurality of third nozzles.

[0012] Furthermore, the power mechanism includes a pipe joint fixedly arranged at the upper end of the grouting pipe, and the other end of the pipe joint is connected to a first supply pipe for providing high-pressure water and high-pressure cement slurry.

[0013] Beneficial Effects

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] A pile tip steel plate with the same outer profile as the precast pile is inserted into the soil body, and high-pressure water is driven by the self-spinning of a rotating nozzle or the rotation of a hollow drill rod driven by a power head, or is sprayed at a fixed angle through an annular slurry distribution pipe to cut and stir the soil within the range of the pile tip steel plate, and under the action of water pressure, the slurry is discharged from the pile top connected to a mud pump, which can eliminate the end bearing force caused by the soil plug effect of the pile tip, so that the precast pile can be smoothly sunk by top pressure or holding pressure. The precast pile of multiple pile sections can be extended by the joint of the grouting pipe and the drill rod. After the pile tip is within a certain range from the design elevation, the high-pressure water is replaced by high-pressure cement slurry. While cutting the soil body, reinforced cement soil is formed within a certain range of the pile tip of the pile hole, which can provide the same end bearing force as the precast closed pile tip. The equipment of the present invention is simple, adaptable to a large range of pile diameters, and is particularly applicable to hollow square piles that are difficult to apply to ordinary central excavation methods. The jet is constrained by the pile tip to completely eliminate the disturbance of the jet to the soil body around the pile, and the adverse effect on the side friction resistance around the pile is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a first embodiment of a pile tip restrained high pressure rotary grouting central excavation pile sinking device of the present invention;

[0017] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0018] Figure 3 It is a horizontal cross-sectional view of the rotating sprinkler;

[0019] Figure 4This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0020] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0021] Figure 6 A schematic diagram of the structure of the third embodiment of the present invention;

[0022] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0023] Figure 8 Schematic diagram of the distribution and ejection direction of the third nozzle.

[0024] Reference Numbers

[0025] Tunneling mechanism 901, power mechanism 902, hollow pile body 1, hollow cavity 11, bearing bracket 12, hollow bearing 13, rotating nozzle 14, pile tip steel plate 15, first nozzle 16, annular slurry distribution pipe 17, third nozzle 18, grouting pipe 2, pipe joint 21, first supply pipe 22, mud pipe 3, hollow drill rod 4, drill rod joint 41, second supply pipe 42, second nozzle 43, power head 5. DETAILED DESCRIPTION

[0026] In order to better illustrate the content of the present invention, the following is a detailed description with reference to the accompanying drawings and implementation examples:

[0027] have Figure 1-Figure 8 As shown, the present invention discloses a pile tip constrained high-pressure rotary grouting central excavation pile driving device, comprising a hollow pile body 1, a hollow cavity 11 is arranged inside the hollow pile body 1, pile tip steel plates 15 are arranged around the bottom of the hollow pile body 1, an excavation mechanism 901 for cutting and stirring the soil is arranged inside the pile tip steel plate 15, a mud pipe 3 is arranged on the top of the hollow pile body 1, the other end of the mud pipe 3 is connected to a mud pump for extracting mud in the hollow pile body 11, and a power mechanism 902 for providing power to the excavation mechanism 901 is also arranged on the upper side of the hollow pile body 1.

[0028] Furthermore, the excavation mechanism 901 includes a bearing bracket 12 fixed in the pile tip steel plate 15, a hollow bearing 13 is installed on the bearing bracket 12, the upper side of the hollow bearing 13 is connected to a grouting pipe 2, and the lower side of the hollow bearing 13 is connected to a rotating nozzle 14.

[0029] Furthermore, a first nozzle 16 is symmetrically arranged inside the rotating nozzle 14 .

[0030] Furthermore, the power mechanism 902 includes a pipe joint 21 fixed to the upper end of the grouting pipe 2, and the other end of the pipe joint 21 is connected to a first supply pipe 22 for providing high-pressure water and high-pressure cement slurry.

[0031] In another embodiment, the excavation mechanism 901 includes a hollow drill rod 4 located inside the hollow cavity 11 , and a second nozzle 43 is disposed at the lower end of the hollow drill rod 4 .

[0032] Furthermore, the power mechanism 902 includes a drill pipe joint 41 connected to the upper end of the hollow drill pipe 4, the upper end of the drill pipe joint 41 is connected to a second supply pipe 42, and the second supply pipe 42 is provided with a power head 5 for driving the second supply pipe 42 and the hollow drill pipe 4 to rotate.

[0033] In another embodiment, the excavation mechanism 901 includes an annular slurry distribution pipe 17 connected to the lower end of the grouting pipe 2, and the lower side of the annular slurry distribution pipe 17 is connected to a plurality of third nozzles 18.

[0034] Furthermore, the power mechanism 902 includes a pipe joint 21 fixed to the upper end of the grouting pipe 2, and the other end of the pipe joint 21 is connected to a first supply pipe 22 for providing high-pressure water and high-pressure cement slurry.

[0035] Specifically, when the first embodiment is in use, high-pressure water is provided in the first supply pipe 22 and sprayed out from the rotating nozzle 14, and the rotating nozzle 14 is driven to rotate while spraying, so as to achieve cutting and stirring of the soil in the pile tip steel plate 15. At the same time, under the action of water pressure, the mud pump is discharged from the upper side of the mud pipe 3 to make the prefabricated pile sink smoothly;

[0036] In the second embodiment, the hollow drill rod 4 is driven to rotate by the power head, and at the same time, high-pressure water is discharged from the second nozzle 43 through the internal pipe space of the hollow drill rod 4, so that the high-pressure water is rotated and sprayed to cut and stir the soil. Then, under the action of water pressure, the mud pump is cooperated to discharge from the upper side of the mud pipe 3, so that the precast pile sinks smoothly.

[0037] The precast piles with multiple pile sections can be extended through the joints of the grouting pipe 2 and the hollow drill rod 4. When the pile tip is within a certain range of the design elevation, the high-pressure water is replaced by high-pressure cement slurry. While cutting the soil, reinforced cement soil is formed within a certain range of the pile tip in the pile hole, which can provide the same end bearing force as the precast closed pile tip.

[0038] In the third embodiment, high-pressure water is provided in the first supply pipe 22 and sprayed out from the third nozzle 18, so that the high-pressure water cuts and excavates the soil in multiple directions. At the same time, under the action of water pressure, the mud pump is discharged from the upper side of the mud pipe 3 to make the precast piles sink smoothly.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the technical solutions of the present invention have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pile tip restrained high pressure rotary grouting central excavation pile sinking device, characterized in that: The invention comprises a hollow pile body (1), wherein a hollow cavity (11) is arranged inside the hollow pile body (1), pile tip steel plates (15) are arranged around the bottom of the hollow pile body (1), and a tunneling mechanism (901) for cutting and stirring soil is arranged inside the pile tip steel plates (15), a mud pipe (3) is arranged on the top of the hollow pile body (1), and the other end of the mud pipe (3) is connected to a mud pump for extracting mud from the hollow pile body (11), and a power mechanism (902) for providing power to the tunneling mechanism (901) is also arranged on the upper side of the hollow pile body (1).

2. A pile tip restrained high pressure rotary grouting central excavation pile sinking device according to claim 1, characterized in that: The excavation mechanism (901) comprises a bearing support (12) fixed in the pile tip steel plate (15), a hollow bearing (13) is mounted on the bearing support (12), a grouting pipe (2) is connected to the upper side of the hollow bearing (13), and a rotating nozzle (14) is connected to the lower side of the hollow bearing (13).

3. A pile tip restrained high pressure rotary grouting central excavation pile sinking device according to claim 2, characterized in that: A first nozzle (16) is symmetrically arranged inside the rotating nozzle (14).

4. A pile tip restrained high pressure rotary grouting central excavation pile sinking device according to claim 3, characterized in that: The power mechanism (902) comprises a pipe joint (21) fixedly arranged at the upper end of the grouting pipe (2), and the other end of the pipe joint (21) is connected to a first supply pipe (22) for providing high-pressure water and high-pressure cement slurry.

5. The pile tip restrained high pressure rotary grouting central excavation pile sinking device according to claim 1, characterized in that: The excavation mechanism (901) comprises a hollow drill rod (4) located inside the hollow cavity (11), and a second nozzle (43) is provided at the lower end of the hollow drill rod (4).

6. A pile tip restrained high pressure rotary grouting central excavation pile sinking device according to claim 5, characterized in that: The power mechanism (902) comprises a drill rod joint (41) connected to the upper end of the hollow drill rod (4); the upper end of the drill rod joint (41) is connected to a second supply pipe (42); and the second supply pipe (42) is provided with a power head (5) for driving the second supply pipe (42) and the hollow drill rod (4) to rotate.

7. The pile tip restrained high pressure rotary grouting central excavation pile sinking device according to claim 1, characterized in that: The excavation mechanism (901) comprises an annular slurry distribution pipe (17) connected to the lower end of the grouting pipe (2), and the lower side of the annular slurry distribution pipe (17) is connected to a plurality of third nozzles (18).

8. The pile tip restrained high pressure rotary grouting central excavation pile sinking device according to claim 7, characterized in that: The power mechanism (902) comprises a pipe joint (21) fixedly arranged at the upper end of the grouting pipe (2), and the other end of the pipe joint (21) is connected to a first supply pipe (22) for providing high-pressure water and high-pressure cement slurry.

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