Cement mixing pile capable of reducing construction disturbance
By combining a split-type helical blade design with a hydraulic damper, the problems of soil disturbance and pile cracking in cement mixing pile construction were solved, achieving more efficient construction and structural protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- C&D HOLSIN ENG CONSULTING CO LTD
- Filing Date
- 2025-03-25
- Publication Date
- 2026-04-28
AI Technical Summary
In the traditional cement mixing pile construction process, excessive drill bit rotation torque or uneven lifting speed can easily cause soil disturbance, uneven grout distribution, pile defects and cracks in adjacent piles, affecting construction quality.
It adopts a split spiral blade design, with the outer spiral blade used for initial soil crushing and the inner spiral blade used for secondary mixing. Combined with a hydraulic damper to absorb vibration energy, the grouting port is sealed to prevent grout leakage, and the spiral teeth enhance the mixing effect.
It reduced construction disturbance, lowered the crack rate of adjacent piles, improved construction efficiency and project quality, and protected the integrity of the surrounding structure.
Smart Images
Figure CN224173302U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of cement pile construction technology, and specifically refers to a cement mixing pile that reduces construction disturbance. Background Technology
[0002] Cement mixing piles are a widely used foundation improvement technology for foundation treatment, soft soil reinforcement, and pile foundation engineering. Its core principle is to mechanically mix cement slurry or other curing agents with the original foundation soil to form cement-soil piles with a certain strength and stability. The technical principle of cement mixing piles is as follows:
[0003] ① Mixing action: Cement slurry is injected into the soil through the drill bit, and the soil and cement slurry are thoroughly mixed by the spiral blades or mixing blades.
[0004] ②Consolidation reaction: The cement grout reacts with the water in the soil to produce hydration products (such as ettringite, calcium silicate gel, etc.), which solidify and harden the soil to form a cement-soil pile with a certain strength.
[0005] ③ Pile function: Cement mixing piles can improve the bearing capacity of the foundation, reduce settlement, enhance soil stability, and have a certain anti-seepage performance.
[0006] During the construction of traditional cement mixing piles, when the mixing drill bit rotates and sprays grout in the soil, disturbances can easily occur due to the following reasons: excessive rotation torque of the drill bit or uneven lifting speed, which damages the surrounding soil structure; fluctuations in grouting pressure leading to uneven grout distribution, resulting in pile defects; and cracks in the already formed pile due to secondary disturbance when adjacent piles are being constructed. Utility Model Content
[0007] The main purpose of this utility model is to provide a cement mixing pile that reduces construction disturbance, solves the problems existing in the prior art, reduces disturbance during construction, and protects the structure around the cement mixing pile.
[0008] To achieve the above objectives, the solution of this utility model is:
[0009] A cement mixing pile for reducing construction disturbance includes a rotating rod, a drill bit welded and fixed to the bottom of the rotating rod, and a mixing assembly disposed on the outside of the drill bit; the mixing assembly includes a plurality of outer helical blades and inner helical blades arranged in a circumferential array on the outside of the drill bit, the blade radius of the outer helical blades being larger than that of the inner helical blades, and the outer helical blades being disposed above and below the inner helical blades; at least three sets of grouting ports arranged in a circumferential array are disposed on the outer side of the upper end of the drill bit.
[0010] Both the outer and inner helical blades are fixed to the outside of the drill bit by welding.
[0011] The rotating rod is internally fitted with a hydraulic damper.
[0012] A sealing seat is installed between the grouting port and the drill bit.
[0013] Each outer helical blade on the outer side of the drill bit has several helical teeth at its upper end, and the helical teeth are evenly spaced. The outer helical blade and the helical teeth are integrally formed.
[0014] Preferably, the helical teeth are arranged along the axial direction of the drill bit.
[0015] The outer helical blade has a blade pitch of 300 mm, and the inner helical blade has a blade pitch of 150 mm.
[0016] After adopting the above technical solution, the present invention has the following technical effects:
[0017] The cement mixing pile of this utility model adopts a split spiral blade design. The drill bit has two layers of outer spiral blades and inner spiral blades. The outer spiral blade (coarse spiral) is used for preliminary soil crushing, and the inner spiral blade (fine spiral) can realize secondary mixing, thereby reducing the torque of single mixing, thereby reducing the disturbance of the surrounding soil and reducing the crack rate of adjacent piles. It can further protect the structure around the cement mixing pile during construction and avoid unnecessary cracks and damage caused by construction. Attached Figure Description
[0018] Figure 1 The mixing pile is a specific embodiment of this utility model. Figure 1 .
[0019] Figure 2 The mixing pile is a specific embodiment of this utility model. Figure 2 .
[0020] Explanation of icon numbers:
[0021] 1-Rotor; 2-Drill bit; 3-Outer spiral blade; 31-Helical tooth; 4-Inner spiral blade; 5-Grouting port; 6-Sealing seat. Detailed Implementation
[0022] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.
[0023] refer to Figure 1-2As shown, this utility model discloses a cement mixing pile that reduces construction disturbance, including a rotating rod 1, a drill bit 2 welded and fixed to the bottom of the rotating rod 1, and a mixing assembly provided on the outside of the drill bit 2; the mixing assembly includes a plurality of outer spiral blades 3 and inner spiral blades 4 arranged in a circumferential array on the outside of the drill bit 2, the blade radius of the outer spiral blades 3 is larger than that of the inner spiral blades 4, and outer spiral blades 3 are provided above and below the inner spiral blades 4; at least three sets of grouting ports 5 arranged in a circumferential array are provided on the outer side of the upper end of the drill bit 2.
[0024] Through the above scheme, the cement mixing pile of this utility model adopts a split spiral blade design. The outer side of the drill bit 2 is provided with two layers: an outer spiral blade 3 and an inner spiral blade 4. The outer spiral blade 3 (coarse spiral) is used for preliminary soil crushing, and the inner spiral blade 4 (fine spiral) can realize secondary mixing, thereby reducing the torque of single mixing, thereby reducing the disturbance of the surrounding soil and reducing the crack rate of adjacent piles. It can further protect the structure around the cement mixing pile during construction and avoid unnecessary cracks and damage caused by construction.
[0025] The following shows a specific embodiment of the above-mentioned cement mixing pile.
[0026] Both the outer helical blade 3 and the inner helical blade 4 are fixed to the outside of the drill bit 2 by welding.
[0027] The aforementioned rotating rod 1 is internally equipped with a hydraulic damper, which dynamically absorbs vibration energy during construction, suppresses mechanical impact caused by sudden changes in soil resistance in the drill bit 2, and protects the structural integrity of adjacent piles.
[0028] A sealing seat 6 is installed between the grouting port 5 and the drill bit 2 to prevent grout leakage, improve grouting efficiency, and reduce seepage disturbance to the surrounding soil.
[0029] Each outer helical blade 3 on the outer side of the drill bit 2 has several helical teeth 31 at its upper end, and these helical teeth 31 are evenly spaced. The outer helical blade 3 and the helical teeth 31 are integrally formed. This design of the helical teeth 31 further enhances the mixing effect of the outer helical blade 3, allowing the soil to be more effectively cut and mixed during the mixing process, thereby increasing soil breaking efficiency and reducing energy loss during the rotation of the drill bit 2. The evenly spaced distribution of the helical teeth 31 ensures uniform mixing, preventing areas where the soil is not fully mixed. Simultaneously, the integrally formed outer helical blade 3 and helical teeth 31 not only improve the structural stability but also simplify the manufacturing process and reduce costs. In practical applications, this design of cement mixing piles can significantly improve construction efficiency and ensure project quality.
[0030] Furthermore, the aforementioned helical teeth 31 are arranged along the axial direction of the drill bit 2.
[0031] The outer spiral blade 3 has a blade pitch of 300 mm, and the inner spiral blade 4 has a blade pitch of 150 mm.
[0032] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.
Claims
1. A cement mixing pile that reduces construction disturbance, characterized in that: The device includes a rotating rod, to which a drill bit is welded and fixed. A stirring assembly is provided on the outer side of the drill bit. The stirring assembly includes several outer helical blades and inner helical blades arranged in a circumferential array on the outer side of the drill bit. The radius of the outer helical blades is larger than that of the inner helical blades, and the outer helical blades are provided above and below the inner helical blades. At least three sets of grouting ports are arranged in a circumferential array on the outer side of the upper end of the drill bit.
2. The cement mixing pile with reduced construction disturbance as described in claim 1, characterized in that: Both the outer and inner helical blades are fixed to the outside of the drill bit by welding.
3. The cement mixing pile with reduced construction disturbance as described in claim 1, characterized in that: The rotating rod is internally fitted with a hydraulic damper.
4. The cement mixing pile with reduced construction disturbance as described in claim 1, characterized in that: A sealing seat is installed between the grouting port and the drill bit.
5. The cement mixing pile with reduced construction disturbance as described in claim 1, characterized in that: Each outer helical blade on the outside of the drill bit has several helical teeth at its upper end, and the helical teeth are evenly spaced. The outer helical blade and the helical teeth are integrally formed.
6. The cement mixing pile with reduced construction disturbance as described in claim 5, characterized in that: The helical teeth are arranged along the axial direction of the drill bit.
7. The cement mixing pile with reduced construction disturbance as described in claim 1, characterized in that: The outer helical blade has a blade pitch of 300 mm, and the inner helical blade has a blade pitch of 150 mm.