Cement mixing pile capable of preventing grout from overflowing
Through the design of relative rotation of the inner drill pipe and the outer drill pipe, combined with the slurry storage cavity and the slurry pipe, the problem of slurry slurry in the construction of cement mixing piles is solved, achieving more uniform stirring and reducing soil disturbances, and avoiding slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slurry slur The phenomenon and reduces the number of motors and saves costs.
Patent Information
- Application Number
- CN202420824350.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-19
AI Technical Summary
Existing cement mixing piles are prone to slurry during construction, resulting in large disturbances in the soil and affecting the construction effect.
A cement mixing pile that prevents slurry from being slurry is designed, and a driving mechanism for rotating the inner drill rod and the outer drill rod are used to form a slurry storage cavity and a spray outlet, which is connected through a slurry pipe, and is combined with a booster mechanism and a gear assembly. Reduce the disturbance and shear force of the stirred leaves on the soil to avoid slurry.
More even stirring is achieved, the construction disturbance to the soil is reduced, and the slurry phenomenon is avoided. At the same time, the number of motors is reduced through the design of gear components and cost savings.
Smart Images
Figure CN222206305U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of soft soil foundation construction, in particular to a cement mixing pile for preventing slurry from bubbling. Background Art
[0002] Cement mixing piles refer to an effective form of soft foundation treatment. It uses cement as the main agent of the curing agent. The cement is sprayed into the soil by a mixing pile machine and fully mixed, so that a series of physical and chemical reactions occur between the cement and the soil, which hardens the soft soil and improves the foundation strength. Cement mixing piles are divided into single-axis, double-axis and three-axis mixing piles according to the main construction methods used. It uses a special deep mixer to forcefully mix the soft soil and cement (curing agent), and uses a series of physical and chemical reactions between cement and soft soil to consolidate the soil to form a cement soil pile with integrity, water stability and a certain strength. This process is mainly used for the treatment of soft soil foundations.
[0003] After the mixing piles are rotary drilled into the soft soil foundation, the soil is greatly disturbed, and slurry is likely to occur when cement is sprayed into the soil.
[0004] Chinese patent CN202322183561.7 discloses "Cement Mixing Pile", announcement number CN220620075U, the device includes a driving rod, multiple groups of first stirring blades and multiple groups of inclined stirring blades; the driving rod extends in the vertical direction; a shotcrete channel extending along the axial direction of the driving rod is provided in the driving rod; multiple groups of first stirring blades are arranged on the driving rod at intervals along the axial direction of the driving rod; one end of the first stirring blade is connected to the driving rod and communicated with the shotcrete channel; the other end of the first stirring blade extends radially along the driving rod; a plurality of first shotcrete holes are provided on the first stirring blade; multiple groups of inclined stirring blades are arranged on the driving rod at intervals along the axial direction of the driving rod; one end of the inclined stirring blade is connected to the driving rod and communicated with the shotcrete channel; the other end of the inclined stirring blade extends in a direction inclined to the first stirring blade; a plurality of second shotcrete holes are provided on the inclined stirring blade, but the device has some defects: the stirring blade of the device greatly disturbs the soil, and slurry is prone to occur. Utility Model Content
[0005] In order to solve the above problems of the prior art, the utility model provides a cement mixing pile with anti-slurry leakage, which can reduce the disturbance of the mixing blades to the soil and avoid the slurry leakage phenomenon.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a slurry-proof cement mixing pile, comprising an inner drill rod, an outer drill rod sleeved on the inner drill rod, a drill bit fixedly connected to the lower end of the inner drill rod, and a rotary drilling blade fixedly connected to the outer side wall of the outer drill rod, the inner drill rod and the outer drill rod are arranged on a driving box, and a driving mechanism for driving the inner drill rod and the outer drill rod to rotate relative to each other is arranged inside the driving box; a slurry storage cavity is formed between the inner drill rod and the outer drill rod, a grouting outlet is formed between the lower end of the outer drill rod and the drill bit, and a slurry delivery pipe connected to the slurry storage cavity is arranged between the inner drill rod and the outer drill rod; a booster mechanism for increasing the cement slurry injection pressure is fixedly connected to the inner drill rod.
[0007] With the above structural design, the drill bit and the outer drill rod rotate relative to each other, making the mixing more uniform and offsetting the shear force generated by the blade mixing, which can reduce the disturbance of the surrounding soil by the mixing pile construction and avoid slurry bubbling.
[0008] Preferably, the driving mechanism includes a first driven gear tightly mounted on the inner drill rod, an intermediate gear meshing with the first driven gear, a first driving gear meshing with the intermediate gear, a second driven gear tightly mounted on the outer drill rod, a second driving gear meshing with the second driven gear, a rotating shaft fixedly connected to both the first driving gear and the second driving gear, and a driving motor transmission-connected to the rotating shaft, and the rotating shaft is rotatably connected to the box wall of the drive box.
[0009] By adopting the above-mentioned structural design and using a gear assembly for transmission, one motor can drive the inner drill rod and the outer drill rod to rotate, thereby reducing the number of motors and saving costs; the outer drill rod and the inner drill rod can be driven to rotate in opposite directions around the rotation axis, respectively, so that the mixing is more uniform, and the shear force generated by the blade mixing is basically offset, which can reduce the disturbance of the surrounding soil body caused by the mixing pile construction and avoid slurry bubbling.
[0010] Preferably, the first driven gear, the first driving gear and the intermediate gear are all helical gears; and the second driven gear and the second driving gear are all bevel gears.
[0011] With the above structural design, helical gears can transmit more power between parallel shafts compared with spur gears; helical gears have higher load capacity and contact ratio, and are smoother and quieter.
[0012] Preferably, a first thrust bearing is arranged between the second driven gear and the box wall of the drive box, and the first thrust cylindrical bearing is sleeved on the outer drill rod; the upper end of the inner drill rod passes through the drive box, and the upper end of the inner drill rod is fixedly connected to a bearing plate, and a second thrust bearing is arranged between the bearing plate and the box wall of the drive box, and the second thrust bearing is sleeved on the inner drill rod.
[0013] The above structural design is adopted to prevent the inner drill rod and the outer drill rod from being separated from the drive box.
[0014] Preferably, a sealing plate is fixedly connected to the inner wall of the drive box, a first bearing is fixedly connected to the inside of the sealing plate, the upper end of the outer drill rod is arranged on the first bearing, the inner drill rod passes through the sealing plate, and the slurry pipe passes through the sealing plate; a sealed bearing is arranged between the inner drill rod and the sealing plate.
[0015] The structural design is adopted to improve the sealing performance of the slurry storage cavity formed between the inner drill rod and the outer drill rod, thereby preventing leakage of cement slurry.
[0016] Compared with the prior art, the beneficial effects of the utility model are:
[0017] 1) The drill bit end of the inner drill rod passes through the outer drill rod, which can reach a deeper mixing area, which is beneficial to the mixing of cement and soil.
[0018] 2) The mixing is more uniform, and the shear force generated by the blade mixing is basically offset, which can reduce the disturbance of the surrounding soil by the mixing pile construction and avoid slurry bubbling. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the structure of the utility model;
[0020] Figure 2 It is a schematic diagram of the structure of the utility model cutaway;
[0021] Figure 3 This is a schematic diagram of the structure of the frame of the utility model from the front; DETAILED DESCRIPTION
[0022] See also Figure 1 , Figure 2 , Figure 3 The utility model provides a technical solution: a cement mixing pile for preventing slurry from leaking, comprising an inner drill rod 11, an outer drill rod 12 sleeved on the inner drill rod 11, a drill bit 13 fixedly connected to the lower end of the inner drill rod 11, and a rotary drilling blade 14 fixedly connected to the outer side wall of the outer drill rod 12. The inner drill rod 11 and the outer drill rod 12 are arranged on a driving box 2, the inner drill rod 11 is rotatably connected to the upper box wall of the driving box 2, the outer drill rod 12 is rotatably connected to the lower box wall of the driving box 2, and a driving mechanism for driving the inner drill rod 11 and the outer drill rod 12 to rotate is arranged inside the driving box 2; the upper end of the inner drill rod 11 passes through the outer drill rod 12 and is rotatably connected to the box wall on the upper side of the driving box 2, and the lower end of the inner drill rod 11 passes through the outer drill rod 12 and is fixedly connected to the drill bit 13.
[0023] A slurry storage cavity 3 is formed between the inner drill rod 11 and the outer drill rod 12, a grouting outlet 4 is formed between the lower end of the outer drill rod 12 and the drill bit 13, and a slurry delivery pipe 8 connected to the slurry storage cavity 3 is arranged between the inner drill rod 11 and the outer drill rod 12, and the slurry delivery pipe 8 is fixedly connected to the box wall of the driving box 2.
[0024] The outer drill rod 12 is cylindrical, and the space between the inner wall of the outer drill rod 12 and the outer wall of the inner drill rod 11 forms a slurry storage cavity 3. The lower end of the slurry delivery pipe 8 penetrates into the space between the inner wall of the outer drill rod 12 and the outer wall of the inner drill rod 11 and is connected to the slurry storage cavity 3. The gap between the lower end of the outer drill rod 12 and the upper surface of the drill bit 13 forms a grouting outlet 4. In order to further control the injection amount and injection speed of the cement slurry, a sealing block 9 is fixedly connected to the upper surface of the drill bit 13 to reduce the size of the grouting outlet 4. The sealing blocks 9 are arranged around the center of the drill bit 13 at equal intervals.
[0025] The driving mechanism includes a first driven gear 51 tightly sleeved on the inner drill rod 11, an intermediate wheel 53 meshing with the first driven gear 51, a first driving gear 61 meshing with the intermediate wheel 53, a second driven gear 52 tightly sleeved on the outer drill rod 12, a second driving gear 62 meshing with the second driven gear 52, a rotating shaft 63 fixedly connected to both the first driving gear 61 and the second driving gear 62, and a driving motor 64 driving the rotating shaft 63 to rotate, the intermediate wheel 53 is rotatably connected to the box wall of the driving box 2, and the rotating shaft 63 is rotatably connected to the box wall of the driving box 2. In this embodiment, the driving motor 64 is fixedly connected to the box wall of the driving box 2.
[0026] After the driving motor 64 drives the rotating shaft 63 to rotate, the first driving gear 61 and the second driving gear 62 on the rotating shaft 63 rotate around the axis of the rotating shaft 63, the first driving gear 61 rotates to drive the second driving gear 62 to rotate around the axis of the rotating shaft 63, the first driving gear 61 rotates to drive the intermediate gear 53 to rotate, the intermediate gear 53 rotates to drive the first driven gear 51 to rotate, thereby realizing the inner drill rod 11 to rotate around its axis, the second driving gear 62 rotates to drive the second driven gear 52 to rotate, thereby realizing the outer drill rod 12 to rotate around its axis. Due to the existence of the intermediate gear 53, the rotation directions of the inner drill rod 11 and the outer drill rod 12 are opposite, and the stirring blade 15 is fixedly connected to the upper end of the drill bit 13, thereby offsetting the shear force generated by the rotary excavation blade 14 and the drill bit 13, which can reduce the disturbance of the surrounding soil body caused by the mixing pile construction and prevent slurry from bubbling.
[0027] In this embodiment, the first driven gear 51, the first driving gear 61, and the intermediate gear 53 are all helical gears; the second driven gear 52 and the second driving gear 62 are all bevel gears. A first thrust bearing 91 is arranged between the second driven gear 52 and the box wall of the drive box 2, and the first thrust bearing 91 is sleeved on the outer drill rod 12. The drive box 2 is supported and connected to the outer drill rod 12 to prevent the outer drill rod 12 from being separated from the drive box; the upper end of the inner drill rod 11 passes through the drive box 2, and the upper end of the inner drill rod 11 is fixedly connected to the bearing plate 93. A second thrust bearing 92 is arranged between the bearing plate 93 and the box wall of the drive box 2, and the second thrust bearing 92 is sleeved on the inner drill rod 11, so that the inner drill rod 11 is supported by the drive box 2 to prevent the inner drill rod 11 and the drill bit 13 from slipping off the drive box 2 due to gravity. Compared with spur gears, helical gears can transmit more power between parallel shafts; helical gears have higher load-bearing capacity and contact ratio and are more stable, and while driving the inner drill rod 11 and the outer drill rod 12 to rotate coaxially and in opposite directions, they ensure the stability of the rotation of the inner drill rod 11 and the outer drill rod 12.
[0028] A sealing plate 21 is fixedly connected to the inner wall of the driving box 2, and a first bearing 94 is fixedly connected to the sealing plate 21. The upper end of the outer drill rod 12 is arranged on the first bearing 94, the inner drill rod 11 passes through the sealing plate 21, and the slurry pipe 8 passes through the sealing plate 21; a sealed bearing is arranged between the inner drill rod 11 and the sealing plate 21; a bearing is arranged between the inner drill rod 11 and the upper box wall of the driving box 2. In this embodiment, the sealing plate 21 is arranged at a position between the first driven gear 51 and the second driven gear 52; the upper end of the inner drill rod 11 passes through the sealing plate 21, and the lower end of the slurry pipe 8 passes through the sealing plate 21, and the lower end of the slurry pipe 8 is arranged between the inner drill rod 11 and the outer drill rod 12, so as to connect the slurry storage cavity 3 between the inner drill rod 11 and the outer drill rod 12.
[0029] When in use, the device needs to be installed on the frame 101 of the cement mixing pile. Two or more cement mixing piles shown in the utility model can be installed on the frame 101 to achieve simultaneous operation of multiple cement slurry mixing piles, thereby realizing multiple groups of piles, improving operation efficiency, and ensuring construction quality.
[0030] This embodiment Figure 3 The example shown is that two cement mixing piles are installed on the frame 101. The rotation directions of the two adjacent outer drill rods 12 are opposite, so that the shear force generated by the mixing of adjacent rotary drilling blades 14 is basically offset, which can reduce the disturbance of the surrounding soil by the mixing pile construction and prevent slurry from bubbling.
[0031] Working principle: the frame 101 is in place on the rotary drilling pile position on the soft soil foundation, the driving motor 64 is started, the first driving gear 61 and the second driving gear 62 on the rotating shaft 63 rotate, the first driving gear 61 rotates to drive the intermediate wheel 53 to rotate, the intermediate wheel 53 rotates to drive the first driven gear 51 to rotate, thereby realizing the rotation of the inner drill rod 11, the drill bit 13 at the lower end of the inner drill rod 11 rotates at the same time, the second driving gear 62 rotates to drive the second driven gear 52 to rotate, thereby realizing the rotation of the outer drill rod 12, due to the existence of the intermediate wheel 53 The inner drill rod 11 and the outer drill rod 12 rotate in opposite directions, and the drill bit 13 and the outer drill rod 12 rotate in opposite directions; the inner drill rod 11 and the outer drill rod 12 penetrate deep into the soft soil foundation, and cement slurry continuously enters the slurry storage cavity 3 through the slurry delivery pipe 8. The drill bit 13 and the outer drill rod 12 rotate relative to each other, and a negative pressure is formed between the drill bit 13 and the outer drill rod 12, so that the soil will not block the grouting outlet 4. When the inner drill rod 11 and the outer drill rod 12 descend to the designed depth, the inner drill rod 11 and the outer drill rod 12 are lifted, and the pile forming is completed.
[0032] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.
[0033] The present invention is described above with reference to the preferred embodiments, but the protection scope of the present invention is not limited thereto, and all technical solutions falling within the scope of the claims are within the protection scope of the present invention. Various improvements may be made to the present invention and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.
Claims
1. A cement mixing pile for preventing slurry from leaking, comprising an inner drill rod (11), an outer drill rod (12) sleeved on the inner drill rod (11), a drill bit (13) fixedly connected to the lower end of the inner drill rod (11), and a rotary drilling blade (14) fixedly connected to the outer side wall of the outer drill rod (12), characterized in that: The inner drill rod (11) and the outer drill rod (12) are arranged on a driving box (2); a driving mechanism for driving the inner drill rod (11) and the outer drill rod (12) to rotate relative to each other is arranged inside the driving box (2); a slurry storage cavity (3) is formed between the inner drill rod (11) and the outer drill rod (12); a grouting outlet (4) is formed between the lower end of the outer drill rod (12) and the drill bit (13); and a slurry delivery pipe (8) communicating with the slurry storage cavity (3) is arranged between the inner drill rod (11) and the outer drill rod (12).
2. The anti-slurry cement mixing pile according to claim 1, characterized in that: The driving mechanism comprises a first driven gear (51) tightly sleeved on the inner drill rod (11), an intermediate gear (53) meshing with the first driven gear (51), a first driving gear (61) meshing with the intermediate gear (53), a second driven gear (52) tightly sleeved on the outer drill rod (12), a second driving gear (62) meshing with the second driven gear (52), a rotating shaft (63) fixedly connected to both the first driving gear (61) and the second driving gear (62), and a driving motor (64) drivingly connected to the rotating shaft (63); the rotating shaft (63) is rotatably connected to the box wall of the driving box (2).
3. The anti-slurry cement mixing pile according to claim 2, characterized in that: The first driven gear (51), the first driving gear (61) and the intermediate gear (53) are all helical gears; the second driven gear (52) and the second driving gear (62) are all bevel gears.
4. The anti-slurry cement mixing pile according to claim 2, characterized in that: A first thrust bearing (91) is arranged between the second driven gear (52) and the box wall of the drive box (2), and the first thrust bearing (91) is sleeved on the outer drill rod (12); the upper end of the inner drill rod (11) passes through the drive box (2), and the upper end of the inner drill rod (11) is fixedly connected to a bearing plate (93), and a second thrust bearing (92) is arranged between the bearing plate (93) and the box wall of the drive box (2), and the second thrust bearing (92) is sleeved on the inner drill rod (11).
5. The anti-slurry cement mixing pile according to claim 1, characterized in that: A sealing plate (21) is fixedly connected to the inner wall of the driving box (2), a first bearing (94) is fixedly connected to the inside of the sealing plate (21), an upper end of the outer drill rod (12) is arranged on the first bearing (94), the inner drill rod (11) passes through the sealing plate (21), and the slurry delivery pipe (8) passes through the sealing plate (21); a sealing bearing is arranged between the inner drill rod (11) and the sealing plate (21).