Micro-disturbance tunneling drill bit
By designing a shrinkable scissor arm structure and a micro-perturbing drill bit with hydraulic assisted cutting, the problems of large existing construction equipment and volatile instability of soft formations are solved, and the construction effect of small disturbances to soil is achieved.
Patent Information
- Application Number
- CN202510697044.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-28
- Publication Date
- 2025-07-08
AI Technical Summary
The existing underground construction technology equipment is huge and is prone to instability and collapse in soft strata, which has a great impact on the surrounding environment and is difficult to meet the construction requirements of micro-disturbance implantation.
A micro-perturbation boring drill bit is designed, adopting a retractable scissor arm structure, equipped with slurry tubes and soil cutting components, including fixed and movable tooths, milling wheels, chain cutting teeth or cutter plates, and the micro-perturbation construction of the implanted components is achieved through hydraulic assisted cutting.
It realizes construction with little disturbance to the soil in soft strata, reduces the impact on the surrounding environment, and is suitable for mechanical cutting and synchronous implantation operations of implanted components.
Smart Images
Figure CN120273634A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of underground construction, and particularly to a technology of a micro-disturbance tunneling bit. Background Art
[0002] At present, for the construction of underground structures such as traditional underground structures, pile foundations, and deep foundation pit supports, construction processes such as bored cast-in-place piles, diaphragm walls, static precast piles, driven precast piles, caissons, and vertical shield tunneling are mostly adopted. The construction equipment is huge, and the construction process has a great impact on the surrounding environment. Therefore, the tunneling bits supporting each process cannot meet the requirements of the micro-disturbance implantation construction process.
[0003] For example, the grab heads or milling bits used in diaphragm wall construction, the grab buckets or milling wheels used in caisson or vertical shield tunneling construction, and the rotary bits or drill buckets used in bored cast-in-place piles are all of fixed sizes. The bits cannot shrink or fold to pass through the members. Moreover, when the above processes encounter soft soil strata such as quicksand, they are prone to instability and collapse, which will affect the surrounding environment. Another example is that static pressure piles, driven piles, etc. are difficult to construct in dense sand layers, etc. During the driving or pressing-in construction, they are prone to produce extrusion effects and damage the surrounding pipelines and structures. Summary of the Invention
[0004] Aiming at the defects existing in the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a micro-disturbance tunneling bit that can be constructed in soft soil strata and has little disturbance to the soil body.
[0005] To solve the above technical problem, a micro-disturbance tunneling bit provided by the present invention includes a bit seat, and a flange for connecting a drill pipe is provided on the bit seat. The characteristics are that: a scissors arm and a slurry pipe are further provided on the bit seat; The scissors arm is composed of a pair of separable and combinable power arms. The two power arms are arranged symmetrically left and right. The upper ends of the two power arms are pivotally connected. The slurry pipe is arranged between the two power arms, and slurry pipe avoidance grooves are formed on the two power arms. After the two power arms are closed, the slurry pipe can be held by the slurry pipe avoidance grooves on the two power arms; A swing oil cylinder for driving the separation and combination of the two power arms is provided on the bit seat. The lower ends of the two power arms are both provided with tunneling cutter seats, and a soil cutting assembly for cutting the soil body is provided on the tunneling cutter seats.
[0006] Further, the soil cutting assembly includes fixed digging teeth fixed on the tunneling cutter seat and movable digging teeth installed on the tunneling cutter seat and capable of swinging left and right. A digging tooth oil cylinder for driving the movable digging teeth to swing left and right is provided on the tunneling cutter seat.
[0007] Further, the soil cutting assembly includes a milling wheel installed on the tunneling cutter seat and a milling motor for driving the milling wheel to rotate.
[0008] Further, the soil cutting assembly includes chain cutting teeth installed on the tunneling cutter base and a chain cutting motor for driving the chain cutting teeth to work.
[0009] Further, the soil cutting assembly includes a cutter head installed on the tunneling cutter base and a cutter head motor for driving the cutter head to work.
[0010] Further, pressure sensors and displacement sensors are provided on the power arms of the scissors arm.
[0011] The micro-disturbance tunneling bit provided by the present invention adopts a retractable scissors arm structure with a small structure, can extend downward to the bottom of the implanted member through the hollow part of the underground structural wall to implement mechanical soil cutting, and can simultaneously adopt hydraulic assisted cutting, and can synchronously implement the implantation operation of the implanted member while cutting, having the advantage of small disturbance to the soil. Description of the Drawings
[0012] Figure 1 is the front view of the micro-disturbance tunneling bit according to the embodiment of the present invention when the two power arms of the scissors arm are in the closed state; Figure 2 is the front view of the micro-disturbance tunneling bit according to the embodiment of the present invention when the two power arms of the scissors arm are in the separated state; Figure 3 is the side view of the micro-disturbance tunneling bit according to the embodiment of the present invention. Detailed Embodiment
[0013] The following further describes the embodiments of the present invention in detail in conjunction with the description of the drawings, but the present embodiments do not limit the present invention. All similar structures and similar changes using the present invention should be included in the protection scope of the present invention. The commas in the present invention all represent the relationship of "and".
[0014] As Figures 1-3 shown, a micro-disturbance tunneling bit provided by an embodiment of the present invention includes a bit base 1 and a scissors arm installed on the bit base 1. A slurry pipe 8 and a flange for connecting a drill pipe are provided on the bit base 1; The scissors arm is composed of a pair of separable and combinable power arms 4. The two power arms 4 are arranged symmetrically left and right. The upper ends of the two power arms 4 are pivotally connected. The slurry pipe 8 is arranged between the two power arms 4, and slurry pipe avoidance grooves are provided on the two power arms 4, so that after the two power arms 4 are closed, the slurry pipe 8 can be held by the slurry pipe avoidance grooves on the two power arms 4; A swing oil cylinder 3 for driving the separation and combination of the two power arms 4 is provided on the bit base 1. Tunneling cutter bases 2 are installed at the lower ends of the two power arms 4, and a soil cutting assembly for cutting soil is provided on the tunneling cutter bases 2; The soil cutting assembly includes a fixed cutting tooth 6 fixed on the tunneling cutter head 2 and a movable cutting tooth 5 installed on the tunneling cutter head 2 and capable of swinging left and right. A cutting tooth oil cylinder 7 for driving the movable cutting tooth 5 to swing left and right is provided on the tunneling cutter head 2.
[0015] In the embodiment of the present invention, a pressure sensor and a displacement sensor are provided on the power arm of the scissors arm.
[0016] In other embodiments of the present invention, the cutting teeth and the cutting tooth oil cylinder on the tunneling cutter head can also be replaced with a milling wheel and a milling motor for driving the milling wheel to rotate, or replaced with chain cutting teeth and a chain cutting motor for driving the chain cutting teeth to work, or replaced with a cutter head and a cutter head motor for driving the cutter head to work.
[0017] The micro-disturbance tunneling bit provided by the present invention is applicable to the implantation construction of underground structural walls, and its working method is as follows: First, connect the lower end of the drill pipe to the upper flange of the bit seat 1, connect the slurry pipe 8 to the hydraulic equipment on the ground with pipe fittings, and extend the tunneling bit downward through the hollow part of the underground structural wall implant member (hereinafter referred to as the implant member) to the bottom of the implant member, then the implantation operation of the implant member can be carried out.
[0018] When the implant member is implanted, the swing oil cylinder 3 drives the two power arms 4 to swing reciprocally and separately, and drives the movable cutting tooth 5 to swing left and right through the cutting tooth oil cylinder 7 to cut the formation at the bottom of the implant member. At the same time, the slurry pipe 8 and the ground hydraulic equipment can be used to perform hydraulic assisted cutting on the formation at the bottom of the implant member. The tunneling process can be monitored through the pressure sensor and the displacement sensor on the power arm, and the formation cutting drilling and member implantation are completed under the state of micro-disturbance to the soil body.
[0019] After the implant member is implanted to the predetermined depth, the tunneling bit can be retracted upward.
Claims
1. A micro-perturbation tunneling bit, comprising a bit seat, wherein a flange for connecting a drill pipe is provided on the bit seat, and it is characterized in that: The drill bit seat is also provided with a shear arm and a slurry pipe; The shear arm is composed of a pair of separable and combinable power arms. The two power arms are arranged symmetrically left and right. The upper ends of the two power arms are pivotally connected. The slurry pipe is arranged between the two power arms, and slurry pipe avoidance grooves are formed on the two power arms. After the two power arms are closed, the slurry pipe can be held by the slurry pipe avoidance grooves on the two power arms; The drill bit seat is provided with a swing oil cylinder for driving the separation and combination of the two power arms. The lower ends of the two power arms are both equipped with tunneling cutter seats, and the tunneling cutter seats are provided with soil cutting assemblies for cutting soil.
2. The micro-perturbation tunneling bit according to claim 1, characterized in that: The soil cutting assembly includes fixed digging teeth fixed on the tunneling cutter seat and movable digging teeth installed on the tunneling cutter seat that can swing left and right. The tunneling cutter seat is provided with a digging tooth oil cylinder for driving the movable digging teeth to swing left and right.
3. The micro-perturbation tunneling bit according to claim 1, wherein: The soil cutting assembly includes a milling wheel installed on the tunneling cutter seat and a milling motor for driving the milling wheel to rotate.
4. The micro-perturbation tunneling bit according to claim 1, characterized in that: The soil cutting assembly includes chain cutting teeth installed on the tunneling cutter seat and a chain cutting motor for driving the chain cutting teeth to work.
5. The micro-perturbation tunneling bit according to claim 1, characterized in that: The soil cutting assembly includes a cutter head installed on the tunneling cutter seat and a cutter head motor for driving the cutter head to work.
6. The micro-perturbation tunneling bit according to claim 1, characterized in that: The power arm of the shear arm is provided with a pressure sensor and a displacement sensor.