High-pressure jet grouting pile drill bit suitable for muddy soft soil foundation

Abstract

The utility model relates to the technical field of jet grouting pile drill bits, and discloses a high-pressure jet grouting pile drill bit suitable for a mucky soft soil foundation, which comprises a jet grouting head body, a grouting pipe is arranged in the jet grouting head body, two branch pipes are arranged at the lower end of the grouting pipe, the end parts of the two branch pipes penetrate through the lower part of the jet grouting head body, and the two branch pipes are connected with the jet grouting head body. A first fixing seat, a second fixing seat and a third fixing seat are sequentially and fixedly mounted on the rotary spray head body from top to bottom, and a first stirring rod, a second stirring rod and a third stirring rod are fixedly mounted on the first fixing seat, the second fixing seat and the third fixing seat through bolts correspondingly; and a downward pressing mechanism for extruding slurry and soil is arranged on the rotary spraying head body. The high-pressure jet grouting pile drill bit suitable for the muddy soft soil foundation can promote mixing of cement paste and a soil body in a muddy soil layer.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotary jet pile drill bits, and in particular relates to a high-pressure rotary jet pile drill bit suitable for a silty soft soil foundation. Background Art

[0002] High-pressure jet grouting piles use high-pressure rotating nozzles to spray cement slurry into the soil layer and mix it with the soil to form a continuous overlapping cement reinforcement body. Jet grouting piles use the three-tube method, that is, three layers of jet pipes are used to spray high-pressure water and air horizontally at the same time, cut the foundation soil, and use the rising force of the air to remove the broken soil from the surface; at the same time, another nozzle sprays cement slurry at low pressure into the cut and stirred foundation, so that the cement slurry is mixed with the soil to achieve the purpose of reinforcement.

[0003] When used in silty soil layers, the construction speed of high-pressure jet grouting piles will be limited due to its high water content, low bearing capacity and poor stability, and the construction technology difficulty will also increase accordingly. At the same time, if the silty soil layer contains too much organic matter, the organic matter will hinder the effective mixing of cement slurry and soil, affecting the quality of high-pressure jet grouting piles. Even if the relevant parameters are determined through pile tests, the quality of high-pressure jet grouting piles may vary during construction in silty soil layers due to actual conditions (such as the unevenness of the soil layer, changes in the groundwater level, etc.). Therefore, we proposed a high-pressure jet grouting pile drill bit suitable for silty soft soil foundations to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a high-pressure jet-jet pile drill bit which can promote the mixing of cement slurry and soil in the muddy soil layer and is suitable for the muddy soft soil foundation.

[0005] In order to achieve the above technical purpose, the technical solution adopted by the utility model is as follows:

[0006] A high-pressure rotary jet pile drill bit suitable for silty soft soil foundations comprises a rotary jet head body, a grouting pipe is arranged inside the rotary jet head body, two branch pipes are arranged at the lower end of the grouting pipe, the ends of the two branch pipes pass through the lower part of the rotary jet head body, a first fixing seat, a second fixing seat and a third fixing seat are fixedly installed on the rotary jet head body from top to bottom in sequence, a first stirring rod, a second stirring rod and a third stirring rod are respectively fixedly installed on the first fixing seat, the second fixing seat and the third fixing seat by bolts, and a downward pressing mechanism for squeezing slurry and soil is arranged on the rotary jet head body.

[0007] It is further defined that a drilling end is fixedly mounted on the lower end of the rotary sprinkler body, and notches are evenly formed on the drilling end. With such a structural design, when the rotary sprinkler body rotates, the drilling end drills into the soil, which can improve the drilling efficiency.

[0008] It is further defined that the first stirring rod includes a transfer rod and a connecting rod, the transfer rod is fixedly mounted on the first fixing seat by bolts, the connecting rod is fixedly mounted on the lower end of the transfer rod by bolts, and the connecting rod is arranged perpendicular to the transfer rod. With such a structural design, the transfer rod and the connecting rod cooperate to further improve the stirring effect, thereby improving work efficiency.

[0009] It is further defined that the pressing mechanism includes a movable disk, a fixed ring and a compression spring, the movable disk is arranged on the rotary sprinkler body, the fixed ring is fixedly installed on the rotary sprinkler body, the movable disk is located between the fixed ring and the first fixed seat, and the compression spring is fixedly installed between the movable disk and the fixed ring. With such a structural design, the movable disk will generate an extrusion force on the mud located below under the elastic force of the compression spring to prevent bubbles from being generated in the mud and affecting the quality of pile formation.

[0010] It is further defined that a folding sleeve is fixedly installed between the fixed ring and the movable disk, an annular elastic sleeve is fixedly installed at the lower end of the movable disk, and the end of the annular elastic sleeve is fixedly connected to the rotary spray head body. With such a structural design, the folding sleeve and the annular elastic sleeve can block the gap between the movable disk and the rotary spray head body without affecting the activity of the movable disk, so as to prevent slurry from entering the gap and affecting the activity of the movable disk.

[0011] The utility model adopting the above technical solution has the following advantages:

[0012] According to the utility model, when the main body of the rotary jet head rotates, the first stirring rod, the second stirring rod and the third stirring rod can break up the silty soil layer. At the same time, the grouting pipe injects cement slurry into the hole. Cooperating with the downward pressure mechanism, the cement slurry and the soil layer can be better combined, thereby improving the pile quality and anti-seepage effect of the high-pressure rotary jet pile in the silty soft soil foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention can be further described by the non-limiting embodiments given in the accompanying drawings;

[0014] Figure 1 This is a schematic structural diagram of a high-pressure jet-jet pile drill bit suitable for silty soft soil foundations of the utility model;

[0015] Figure 2 This is a structural schematic diagram of another angle of a high-pressure jet-jet pile drill bit suitable for silty soft soil foundation of the utility model;

[0016] Figure 3 It is a partial cross-sectional structural schematic diagram of a high-pressure jet-jet pile drill bit suitable for silty soft soil foundation of the utility model;

[0017] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0018] The main component symbols are described as follows:

[0019] 1. Spray nozzle body; 11. Drilling end;

[0020] 2. Grouting pipe;

[0021] 3. First fixing seat; 31. First stirring rod;

[0022] 4. Second fixing seat; 41. Second stirring rod;

[0023] 5. The third fixing seat; 51. The third stirring rod;

[0024] 6. movable plate; 61. fixed ring; 62. compression spring;

[0025] 7. Folding sleeve; 8. Annular elastic sleeve. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that in the drawings or in the specification, similar or identical parts use the same figure numbers, and the implementation methods not shown or described in the drawings are forms known to ordinary technicians in the relevant technical field. In addition, the directional terms mentioned in the embodiments, such as "upper", "lower", "top", "bottom", "left", "right", "front", "back", etc., are only referenced to the directions of the drawings and are not used to limit the scope of protection of the present invention.

[0027] like Figure 1 to Figure 4 As shown, the utility model is a high-pressure rotary jet pile drill bit suitable for silty soft soil foundation, including a rotary jet head body 1, a grouting pipe 2 is arranged inside the rotary jet head body 1, and two branch pipes are arranged at the lower end of the grouting pipe 2, and the ends of the two branch pipes pass through the lower part of the rotary jet head body 1, and a first fixing seat 3, a second fixing seat 4 and a third fixing seat 5 are fixedly installed on the rotary jet head body 1 from top to bottom in sequence, and a first stirring rod 31, a second stirring rod 41 and a third stirring rod 51 are fixedly installed on the first fixing seat 3, the second fixing seat 4 and the third fixing seat 5 respectively by bolts, and the first stirring rod 31, the second stirring rod 41 and the third stirring rod 51 are fixed by bolts, which are convenient for disassembly and assembly, and more convenient for use, and a downward pressing mechanism that has an extruding effect on slurry and soil is provided on the rotary jet head body 1.

[0028] A drilling end 11 is fixedly mounted on the lower end of the rotary sprinkler body 1. Notches are evenly formed on the drilling end 11. When the drilling end 11 rotates, the resistance encountered during drilling can be reduced to improve the drilling efficiency.

[0029] The first stirring rod 31 includes a transfer rod and a connecting rod. The transfer rod is fixedly mounted on the first fixing seat 3 by bolts. The connecting rod is fixedly mounted on the lower end of the transfer rod by bolts. The connecting rod is arranged perpendicular to the transfer rod.

[0030] The pressing mechanism includes a movable disk 6, a fixed ring 61 and a compression spring 62. The movable disk 6 is arranged on the rotary spray head body 1, the fixed ring 61 is fixedly installed on the rotary spray head body 1, the movable disk 6 is located between the fixed ring 61 and the first fixed seat 3, and the compression spring 62 is fixedly installed between the movable disk 6 and the fixed ring 61.

[0031] A folding sleeve 7 is fixedly installed between the fixed ring 61 and the movable disk 6, and an annular elastic sleeve 8 is fixedly installed at the lower end of the movable disk 6. The end of the annular elastic sleeve 8 is fixedly connected to the rotary sprinkler body 1. The folding sleeve 7 cooperates with the annular elastic sleeve 8 to ensure the sealing between the movable disk 6 and the rotary sprinkler body 1 without affecting the up and down movement of the movable disk 6, so as to prevent mud from flowing into the gap and affecting the operation of the downward pressure mechanism.

[0032] The method of using the utility model is as follows:

[0033] When in use, the rotary sprinkler body 1 rotates and moves downward, and the drilling end 11 drills into the soil. The first stirring rod 31, the second stirring rod 41 and the third stirring rod 51 will break up the muddy soil layer when entering the soil. When the rotary sprinkler body 1 reaches the specified depth, the grouting pipe 2 transports the cement slurry downward, and the rotating first stirring rod 31, the second stirring rod 41 and the third stirring rod 51 will stir the cement slurry and the soil layer at that place to make them better combined;

[0034] When the cement slurry and the soil layer are stirred, the movable plate 6 will be squeezed downward by the elastic force of the compression spring 62, which can make the cement slurry and the soil layer more tightly combined, avoid the problem of internal cavity when the cement slurry and the soil layer are combined, and reduce the quality of pile formation.

[0035] The above is a detailed introduction to a high-pressure jet grouting pile drill bit suitable for silty soft soil foundation provided by the utility model. The description of the specific embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A high-pressure jet grouting pile drill bit suitable for silty soft soil foundation, comprising a jet grouting head body (1), characterized in that: A grouting pipe (2) is provided inside the jet grouting head body (1), and two branch pipes are provided at the lower end of the grouting pipe (2), and the ends of the two branch pipes pass through the lower part of the jet grouting head body (1). A first fixing seat (3), a second fixing seat (4) and a third fixing seat (5) are fixedly installed on the jet grouting head body (1) in sequence from top to bottom, and a first stirring rod (31), a second stirring rod (41) and a third stirring rod (51) are fixedly installed on the first fixing seat (3), the second fixing seat (4) and the third fixing seat (5) respectively by bolts. A downward pressing mechanism having a squeezing effect on slurry and soil is provided on the jet grouting head body (1).

2. The high-pressure jet grouting pile drill bit suitable for silty soft soil foundation according to claim 1 is characterized by: A drilling end head (11) is fixedly mounted on the lower end of the rotary spray head body (1), and notches are evenly formed on the drilling end head (11).

3. The high-pressure jet grouting pile drill bit suitable for silty soft soil foundation according to claim 1 is characterized by: The first stirring rod (31) comprises a transfer rod and a connecting rod, the transfer rod is fixedly mounted on the first fixing seat (3) by means of bolts, the connecting rod is fixedly mounted on the lower end of the transfer rod by means of bolts, and the connecting rod is arranged perpendicular to the transfer rod.

4. The high-pressure jet grouting pile drill bit suitable for muddy soft soil foundation according to claim 3 is characterized by: The pressing mechanism comprises a movable disk (6), a fixed ring (61) and a compression spring (62); the movable disk (6) is arranged on the rotary spray head body (1); the fixed ring (61) is fixedly mounted on the rotary spray head body (1); the movable disk (6) is located between the fixed ring (61) and the first fixed seat (3); and the compression spring (62) is fixedly mounted between the movable disk (6) and the fixed ring (61).

5. The high-pressure jet grouting pile drill bit suitable for muddy soft soil foundation according to claim 4 is characterized by: A folding sleeve (7) is fixedly installed between the fixed ring (61) and the movable disk (6), an annular elastic sleeve (8) is fixedly installed at the lower end of the movable disk (6), and the end of the annular elastic sleeve (8) is fixedly connected to the rotary spray head body (1).

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