Multi-pipe jet grouting pile

Abstract

The utility model relates to the technical field of building construction, in particular to a multi-pipe jet grouting pile which comprises a drill rod assembly and a driving device, the drill rod assembly comprises a hollow drill rod capable of rotating independently and jet units, the outer wall of the drill rod assembly is hollowed out, the side wall of the hollow drill rod is fixedly connected with a plurality of layers of jet units, and the jet units are fixedly connected with the driving device. The spraying units comprise a plurality of high-pressure nozzles, the spraying units of the hollow drill rod are distributed in a staggered mode in the vertical direction, the driving device is connected with the drill rod assemblies, a mixing cavity is formed in the bottom end of the hollow drill rod, the top end of the mixing cavity is communicated with a plurality of pipelines, and the pipelines and the hollow drill rod are evenly distributed at the top end of the mixing cavity. Through the multiple high-pressure nozzles, the multiple injection units and the multiple drill rod assemblies, slurry enters all the hollow drill rods through pipelines and then passes through the injection units and the high-pressure nozzles, so that the slurry is evenly injected to the inner wall of a foundation pit, and the bearing capacity of the foundation is improved.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and in particular to a multi-tube jet grouting pile. Background Technology

[0002] Jet grouting technology uses high-pressure jetting to mix solidified grout with the soil to form reinforced piles. It is widely used in soft soil foundation treatment, deep foundation pit support, and other projects. However, traditional jet grouting has a limited grout diffusion radius.

[0003] The aforementioned existing technical solutions have the following drawbacks: the diffusion radius of the sprayed slurry is limited, or the mixing is uneven. Utility Model Content

[0004] The purpose of this invention is to provide a multi-tube jet grouting pile to solve the problems existing in the prior art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A multi-tube jet grouting pile includes a drill rod assembly and a drive device. The drill rod assembly includes an independently rotatable hollow drill rod and jetting units. The outer wall of the drill rod assembly is hollow. Multiple jetting units are fixedly connected to the side wall of the hollow drill rod. Each jetting unit includes multiple high-pressure nozzles. The jetting units of the hollow drill rod are staggered in the vertical direction. The drive device is connected to each drill rod assembly. A mixing chamber is provided at the bottom end of the hollow drill rod. Multiple pipes are connected to the top end of the mixing chamber. The pipes and the hollow drill rod are evenly distributed at the top end of the mixing chamber.

[0007] By adopting the above technical solution, slurry is introduced into each hollow drill rod through pipelines via multiple high-pressure nozzles, multiple injection units, and multiple drill rod assemblies. After passing through the injection units and high-pressure nozzles, the slurry is evenly sprayed onto the inner wall of the foundation pit, thereby increasing the bearing capacity of the foundation.

[0008] In a further embodiment, the driving device includes a motor and a telescopic rod, wherein the motor is fixedly connected to each drill pipe assembly, and the telescopic rod is fixedly connected to each drill pipe assembly.

[0009] In a further embodiment, the multi-layer spraying unit comprises at least three layers, with the diameter of the upper layer nozzle being smaller than that of the lower layer nozzle, and the spraying pressure of the slurry in each layer increasing progressively.

[0010] In a further embodiment, the pipeline includes a cement slurry channel, a quick-setting agent channel, and a compressed air channel, which are mixed at the bottom of the hollow drill pipe through a mixing chamber.

[0011] In a further embodiment, the outer wall of the drill pipe assembly is provided with spiral guide vanes, the height of which varies gradient with increasing depth.

[0012] In a further embodiment, the injection angle of the high-pressure nozzle is spirally distributed along the drill rod axis, and the injection directions of the high-pressure nozzles of adjacent hollow drill rods are inclined in opposite directions.

[0013] In summary, this utility model has the following beneficial effects:

[0014] 1. The design of connecting the mixing chamber at the bottom of the hollow drill pipe through the cement slurry channel, the accelerator channel and the compressed air channel can achieve uniform mixing of air, cement slurry and accelerator, and increase the support for the tunnel wall;

[0015] 2. The multi-layer spraying unit contains at least three layers, with the nozzle diameter of the upper layer being smaller than that of the lower layer, and the spraying pressure of each layer of slurry increasing progressively. The spraying unit includes multiple high-pressure nozzles, which can increase the speed and range of the spraying, making the spray more evenly distributed on the tunnel wall. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the drill pipe assembly structure of this utility model;

[0018] In the diagram, 1 is the drill pipe assembly; 2 is the drive unit; 21 is the motor; 22 is the telescopic rod; 3 is the hollow drill pipe; 4 is the injection unit; 41 is the high-pressure nozzle; 5 is the mixing chamber; 6 is the pipeline; 61 is the cement slurry channel; 62 is the accelerator channel; and 63 is the compressed air channel. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0021] Example 1:

[0022] like Figure 1-2 As shown, 1. A multi-tube jet grouting pile includes a drill rod assembly 1 and a drive device 2. The drill rod assembly 1 includes a hollow drill rod 3 that can be rotated independently and a jetting unit 4. The outer wall of the drill rod assembly 1 is hollow. Multiple jetting units 4 are fixedly connected to the side wall of the hollow drill rod 3. The jetting unit 4 includes multiple high-pressure nozzles 41. The jetting units 4 of the hollow drill rod 3 are staggered in the vertical direction. The drive device 2 is connected to each drill rod assembly 1. A mixing chamber 5 is provided at the bottom end of the hollow drill rod 3. Multiple pipes 6 are connected to the top end of the mixing chamber 5. The pipes 6 and the hollow drill rod 3 are evenly distributed at the top end of the mixing chamber 5.

[0023] The drive device includes a motor 21 and a telescopic rod 22. The motor 21 is fixedly connected to each drill pipe assembly 1, and the telescopic rod 22 is fixedly connected to each drill pipe assembly 1.

[0024] The multi-layer spraying unit 4 includes at least three layers, with the diameter of the upper high-pressure nozzle 41 being smaller than that of the lower high-pressure nozzle 41, and the spraying pressure of the slurry in each layer increasing progressively.

[0025] Pipeline 6 includes a cement slurry channel 61, a quick-setting agent channel 62, and a compressed air channel 63. The cement slurry channel 61, the quick-setting agent channel 62, and the compressed air channel 63 are mixed at the bottom of the hollow drill rod 3 through a mixing chamber 5.

[0026] The outer wall of the drill pipe assembly 1 is provided with spiral guide vanes, and the height of the guide vanes changes in a gradient with increasing depth.

[0027] The injection angle of the high-pressure nozzle 41 is spirally distributed along the drill rod axis, and the injection directions of the high-pressure nozzles 41 of adjacent hollow drill rods 3 are inclined in opposite directions.

[0028] Specific implementation process: The cement slurry is first mixed evenly in the mixing chamber 5 through the cement slurry channel 61, the quick-setting agent channel 62 and the compressed air channel 63. The hollow drill rod 3 is rotated by the motor 21, so that the slurry sprayed by the high-pressure nozzle 41 is evenly sprayed on the inner wall of the foundation. As the foundation deepens, the hollow drill rod 3 is driven to move downward by the telescopic rod 22, thereby causing the drill rod assembly 1 to move downward.

[0029] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0030] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A multi-tube jet grouting pile, comprising a drill rod assembly (1) and a drive device (2), characterized in that: The drill rod assembly (1) includes a hollow drill rod (3) that can be rotated independently and an injection unit (4). The outer wall of the drill rod assembly (1) is hollow. A multi-layer injection unit (4) is fixedly connected to the side wall of the hollow drill rod (3). The injection unit (4) includes multiple high-pressure nozzles (41). The injection units (4) of the hollow drill rod (3) are staggered in the vertical direction. The driving device (2) is connected to each drill rod assembly (1). A mixing chamber (5) is provided at the bottom of the hollow drill rod (3). A multiple pipe (6) is connected to the top of the mixing chamber (5). The pipe (6) and the hollow drill rod (3) are evenly distributed at the top of the mixing chamber (5).

2. The multi-pipe rotary jet grouting pile according to claim 1, characterized in that: The driving device includes a motor (21) and a telescopic rod (22). The motor (21) is fixedly connected to each drill rod assembly (1), and the telescopic rod (22) is fixedly connected to each drill rod assembly (1).

3. The multi-pipe jet grouting pile according to claim 1, wherein: The multi-layer spraying unit (4) includes at least three layers, with the diameter of the upper high-pressure nozzle (41) being smaller than that of the lower high-pressure nozzle (41), and the spraying pressure of the slurry in each layer increasing progressively.

4. The multi-pipe jet grouting pile according to claim 1, wherein: The pipeline (6) includes a cement slurry channel (61), a quick-setting agent channel (62), and a compressed air channel (63). The cement slurry channel (61), the quick-setting agent channel (62), and the compressed air channel (63) are mixed at the bottom of the hollow drill rod (3) through a mixing chamber (5).

5. The multi-pipe jet grouting pile according to claim 1, wherein: The outer wall of the drill pipe assembly (1) is provided with a spiral guide vane, and the height of the guide vane changes in a gradient with increasing depth.

6. The multi-pipe jet grouting pile according to claim 1, wherein: The injection angle of the high-pressure nozzle (41) is spirally distributed along the drill rod axis, and the injection directions of the high-pressure nozzles (41) of adjacent hollow drill rods (3) are inclined in opposite directions.

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