Improved drill bit device for high-pressure jet grouting anchor cable construction in hard sand layer
By modifying the drill bit device and employing high-pressure water cutting and a buffer mechanism in hard sand layers, the problem of ordinary drill bits being unable to penetrate was solved, achieving efficient and stable construction results.
Patent Information
- Application Number
- CN202520518762.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-03-24
AI Technical Summary
In hard sand layers, ordinary claw drill bits cannot penetrate effectively, resulting in low efficiency of high-pressure jet grouting anchor cable construction, and existing technologies need to be improved.
Design a modified drill bit device, including drill rod, casing, side nozzle, front nozzle and drill bit, to soften the soil by high-pressure water cutting, and to achieve drill bit protection and efficient drilling by combining a buffer mechanism, reinforcing hoop and pressure sensor.
It improves drilling efficiency in hard sand layers, extends drill bit life, reduces stuck drill and broken drill bits, and ensures high efficiency and accuracy in construction.
Smart Images
Figure CN223689630U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of building construction, especially relates to a modified drill bit device for high-pressure rotary jet anchor cable construction in hard sand layer. BACKGROUND
[0002] High-pressure rotary jet anchor cable is widely used in super-deep foundation pit design because of its excellent anchoring force, compared with ordinary prestressed anchor cable, the axial tension that high-pressure rotary jet anchor cable can bear is increased by several times, which can effectively improve the safety and stability of the foundation pit.
[0003] High-pressure rotary jet anchor cable uses hollow drill pipe, the front section of the drill bit uses a "claw type" drill bit, and the small holes on both sides of the drill bit are used to cut the soil by pressurized cement slurry. In ordinary clay and silt soil, the anchor cable machine can normally drill into a hole.
[0004] Due to the influence of site geological conditions, the lower soil is extruded by the upper soil, the compactness increases, especially in hard sand layer (commonly known as "steel plate sand"), after drilling to a certain depth, the ordinary "claw type" drill bit cannot continue to excavate, and other methods need to be used to improve the drill bit, which will reduce the construction efficiency, therefore, a modified drill bit for high-pressure rotary jet anchor cable construction in hard sand layer that can improve the drilling efficiency needs to be developed. UTILITY MODEL CONTENTS
[0005] The utility model discloses a modified drill bit device for high-pressure rotary jet anchor cable construction in hard sand layer, which can cut the soil in front of the drill bit with high-pressure water, soften the soil in front of the drill bit and change it into flowable soil, thereby improving the drilling efficiency.
[0006] The technical scheme for solving the technical problem of the utility model is as follows: a modified drill bit device for high-pressure rotary jet anchor cable construction in hard sand layer, comprising a drill pipe, a water guide pipe arranged in the drill pipe, a sleeve, a side nozzle, a front nozzle and a drill bit, the sleeve is connected to the drill pipe, the side nozzle is horizontally arranged in the sleeve, the front nozzle is vertically arranged in the drill pipe, the side nozzle and the front nozzle are connected to the water guide pipe, the drill bit is connected to the drill pipe through a support, and a buffer mechanism is arranged on the drill bit.
[0007] Preferably, the buffer mechanism comprises a spring, the spring is connected to the drill bit and the drill pipe, and the spring is arranged in an array.
[0008] Preferably, a guide telescopic rod is arranged in the spring.
[0009] Preferably, a pressure sensor is arranged at the connection between the spring and the drill pipe.
[0010] Preferably, a reinforcing hoop is arranged around the drill bit.
[0011] As preferred, the drill head and the front-end nozzle are arranged in a spaced apart manner in a horizontal projection.
[0012] As preferred, the side nozzles are arranged in an array on the casing.
[0013] As preferred, the drill head and the drill rod are detachably connected.
[0014] The effects provided in the content of the utility model are only the effects of the embodiments, and are not all the effects of the utility model. The above technical solutions have the following advantages or beneficial effects:
[0015] 1. By arranging the front-end nozzle, hard soil can be softened into flowable soil through high-pressure water cutting of the front soil while the drill head is drilling, thereby improving the drilling efficiency.
[0016] 2. By arranging the buffer assembly between the drill head and the drill rod, the pressure of the drill head when drilling hard soil can be reduced, thereby prolonging the service life of the drill head. In combination with the pressure sensor at the connecting position of the spring and the drill rod, when the pressure sensor receives the spring pressure exceeding the preset threshold value, the operator can appropriately prolong the cutting time of the front-end nozzle or replace the drill head according to the hardness of the soil, thereby improving the work efficiency while protecting the drill head.
[0017] 3. By arranging the reinforcing hoop around the drill head, the strength of the drill head can be improved, the probability of sticking or breaking the drill can be reduced, and the construction process can be avoided.
[0018] 4. By arranging the guide rod in the spring, the eccentricity of the drill head caused by excessive lateral stress can be prevented, thereby improving the accuracy of drilling. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 is a front view of the utility model;
[0020] Figure 2 is a front view of the utility model; Figure 1 is a sectional view in A-A direction of the utility model;
[0021] Figure 3 is a right view of the utility model;
[0022] Figure 4 is a top view of the utility model;
[0023] Figure 5 is a general structure of the utility model Figure 1 ;
[0024] Figure 6 is a general structure of the utility model Figure 2 .
[0025] Wherein: 1, drill pipe; 2, casing; 3, side jet; 4, front end jet; 5, spring; 51, telescopic rod; 52, pressure sensor; 6, drill bit; 61, reinforcing hoop. DETAILED DESCRIPTION
[0026] In order to clearly illustrate the technical features of the scheme, the utility model is described in detail below through specific embodiments, and in conjunction with its drawings.
[0027] Example 1
[0028] Reference Figures 1 to 6 A modified drill bit device for high-pressure rotary jet anchor construction in hard sand layer, comprising a drill pipe 1, a water guide pipe is arranged inside the drill pipe 1; further comprising a casing 2, a side jet 3, a front end jet 4 and a drill bit 6, the casing 2 is connected to the drill pipe 1, the side jet 3 is arranged horizontally in the casing 2, the front end jet 4 is arranged longitudinally in the drill pipe 1, the side jet 3 and the front end jet 4 are both connected to the water guide pipe, the drill bit 6 is connected to the drill pipe 1 through a support, and a buffer mechanism is arranged on the drill bit 6.
[0029] As shown in Figure 1 and Figure 5 , the buffer mechanism comprises a spring 5, the spring 5 connects the drill bit 6 and the drill pipe 1, and the spring 5 is arranged in an array.
[0030] As shown in Figure 2 , a guide telescopic rod 51 is arranged inside the spring 5.
[0031] As shown in Figure 5 , a pressure sensor 52 is arranged at the connection between the spring 5 and the drill pipe 1.
[0032] As shown in Figures 3 to 5 , a reinforcing hoop 61 is arranged around the drill bit 6.
[0033] As shown in Figure 3 , the drill bit 6 and the front end jet 4 are arranged at intervals in horizontal projection.
[0034] As shown in Figure 2 and Figure 3 , the side jet 3 is arranged in an array on the casing 2.
[0035] The drill bit 6 and the drill pipe 1 are detachably connected.
[0036] Working principle
[0037] The device realizes efficient and stable drilling and anchoring forming in hard sand layer by setting a buffer mechanism between the drill bit 6 and the drill pipe 1, combining a high-pressure jet system and structural reinforcement design. When the drill bit 6 starts drilling, the water guide pipe delivers high-pressure water to the front-end nozzle 4 of the drill pipe 1, which sprays vertically to the front hard sand layer. Through high-pressure hydraulic cutting, the sand layer is broken and softened into flowable soil, reducing the resistance of the drill bit 6 directly contacting the hard sand. The arrayed side nozzles 3 on the casing 2 spray high-pressure slurry synchronously and laterally, cutting and solidifying the soil around the borehole to form a uniform anchoring body structure. During drilling, when the drill bit 6 encounters hard sand or rock, the spring 5 compresses to absorb the impact force, preventing the drill bit 6 from breaking or wearing out due to excessive instantaneous pressure. The guide telescopic rod 51 inside the spring 5 limits the lateral displacement of the drill bit 6, ensuring that the drilling direction is vertical and preventing the borehole from deviating due to lateral stress. The pressure sensor 52 at the connection of the spring 5 monitors the force on the drill bit 6 in real time. When the pressure exceeds the preset threshold, an alarm is triggered to prompt the operator to adjust the jet parameters or pause drilling to protect the drill bit 6. The reinforcing hoop 61 on the circumference of the drill bit 6 improves the overall structural strength, resisting the extrusion deformation of the drill bit 6 by the hard sand layer and reducing the risk of sticking. The drill bit 6 and the front-end nozzle 4 are spaced apart in the horizontal projection to avoid the softened soil after cutting from being directly backfilled to the drill bit 6 path, and also to avoid the high-pressure water sprayed by the front-end nozzle 4 from being directly sprayed on the drill bit 6, better ensuring the continuity of drilling.
[0038] Specific operation process
[0039] Select a suitable drill bit 6, connect the drill pipe 1 and the drill bit 6 through a detachable interface, and calibrate the sensor threshold to set the upper limit of the pressure. Connect the high-pressure pump and the water guide pipe, test the jet effect of the front-end nozzle 4 and the side nozzle 3, and adjust the jet pressure.
[0040] Start the drilling machine, drill into the hard sand layer, and at the same time, start the high-pressure jet of the front-end nozzle 4 to continuously soften the soil in front. After drilling to the set depth, start the lateral jet of the side nozzle 3, and the cement slurry forms an anchoring body through the side nozzle 3 of the casing 2. If the pressure value continues to be lower than the threshold, gradually increase the rotation speed of the drill bit 6 to speed up the drilling. If the pressure value exceeds the threshold, immediately reduce the rotation speed or pause the drilling, extend the cutting time of the front-end nozzle 4, and continue the operation after the soil is fully softened.
[0041] When the sensor alarm or the torque of the drill pipe 1 abnormally rises, start the reverse rotation mode, and cooperate with the reverse jet of the side nozzle 3 to clear the blocked sand particles. If the overpressure alarm occurs multiple times or the drill bit 6 is severely worn, disassemble the drill bit 6 and replace it with a spare function.
[0042] After drilling to the designed depth, keep the side nozzle 3 jetting until the anchoring body reaches the preset diameter, and when the drill pipe 1 is withdrawn, continuously inject cement slurry to fill the hole to ensure the compactness of the anchoring body.
[0043] Through the above working principle and operation process, the device realizes the construction goal of high efficiency, low consumption and high precision in hard sand layer, and has significant technical innovation and practicality.
[0044] Although the specific embodiments of the utility model have been described above with reference to the drawings, it is not a limitation on the protection scope of the utility model, and various modifications or changes made by those skilled in the art on the basis of the technical scheme of the utility model without creative labor are still within the protection scope of the utility model.
Claims
1. A modified drill bit device for high-pressure jet grouting anchor construction in hard sand layers, comprising a drill pipe (1), a water guide pipe is arranged inside the drill pipe (1), characterized in that: It also includes a sleeve (2), a side nozzle (3), a front nozzle (4) and a drill bit (6), the sleeve (2) is connected to the drill rod (1), the side nozzle (3) is transversely arranged in the sleeve (2), the front nozzle (4) is longitudinally arranged in the drill rod (1), the side nozzle (3) and the front nozzle (4) are connected with the water guide pipe, the drill bit (6) is connected with the drill rod (1) through a support, and the drill bit (6) is provided with a buffer mechanism.
2. The modified drill bit device for high-pressure jet grouting anchor construction in hard sand layer according to claim 1, characterized in that, The buffer mechanism includes a spring (5) connected between the drill bit (6) and the drill rod (1), and the spring (5) is arranged in an array.
3. The modified drill bit device for high-pressure jet grouting anchor construction in hard sand layer according to claim 2, characterized in that, The spring (5) is internally provided with a guide telescopic rod (51).
4. The modified drill bit device for high-pressure jet grouting anchor construction in hard sand layer according to claim 2, characterized in that, The spring (5) is provided with a pressure sensor (52) at the connection with the drill rod (1).
5. The modified drill bit device for high-pressure jet grouting anchor construction in hard sand layers according to claim 1, characterized in that, The drill bit (6) is provided with a reinforcing hoop (61) around.
6. The modified drill bit device for high-pressure jet grouting anchor construction in hard sand layers according to claim 1, characterized in that, The drill bit (6) and the front nozzle (4) are arranged at intervals in the horizontal projection.
7. The modified drill bit device for high-pressure jet grouting anchor construction in hard sand layers according to claim 1, characterized in that, The side nozzle (3) is arranged in an array on the sleeve (2).
8. The modified drill bit device for high-pressure jet grouting anchor construction in hard sand layers according to claim 1, characterized in that, The drill bit (6) and the drill rod (1) are detachably connected.