Drill bit capable of synchronously completing drilling and wall protection construction

Abstract

A drill bit capable of synchronously completing drilling and wall protection construction relates to the technical field of cast-in-place pile construction, and adopts the technical scheme that the drill bit comprises a drilling bucket and a reaming device, the drilling bucket is provided with a partition plate, an inner cavity of the drilling bucket is divided into a slurry cavity and a soil sampling cavity, a soil sampling opening is formed in the side wall of the soil sampling cavity, and the slurry cavity is provided with a slurry inlet and a slurry outlet extending to the soil sampling opening; the slurry cavity is provided with a rotating sleeve, the rotating sleeve is in transmission connection with a rotating shaft, and the rotating shaft is in sliding connection with the rotating sleeve; the rotating sleeve is further provided with a positioning sleeve, the rotating shaft is provided with an extending part in sliding connection with the positioning sleeve, the side wall of the positioning sleeve is further provided with a sliding groove, and the extending part is provided with a pin shaft sliding relative to the sliding groove; the reaming device comprises a wing plate rotationally connected with the positioning sleeve, a connecting rod is hinged between the wing plate and the pin shaft, and reaming teeth are arranged at the tail end of the wing plate. Drilling, reaming, soil taking and wall protecting are completed synchronously, the construction technology is simplified, the construction efficiency is improved, the cost is reduced, and the environmental protection risk is low.

Description

Technical Field

[0001] This utility model relates to the field of cast-in-place pile construction technology, and in particular to a drill bit that can simultaneously complete drilling and wall protection construction. Background Technology

[0002] Rotary drilling rigs are commonly used for cast-in-place pile construction. Existing rotary drilling rigs generally employ tubular drill bits with bottom valves, allowing drilling and soil removal to be completed in a single pass. However, drilling in loose soil layers or areas with groundwater distribution presents challenges due to poor borehole wall stability, leading to potential collapse and necking. Conventional construction methods require additional wall protection measures after drilling and soil removal, such as mud slurry or steel cylinder wall protection. Mud slurry wall protection involves mud preparation, waste mud treatment, excavation of mud pits, sedimentation tanks, and conveying trenches, as well as mud circulation for slag removal and concrete pouring to replace the mud slurry. This method is difficult to control in concealed operations, involves cumbersome construction steps, is costly, and carries significant environmental pressure. Steel cylinder wall protection, on the other hand, requires prior drilling, and the steel cylinder is difficult to sink when the borehole wall is unstable. Furthermore, its manufacturing and installation costs are high, and construction efficiency is low. Utility Model Content

[0003] In cases of poor borehole wall stability, existing drilling and wall protection construction procedures are cumbersome and costly. This utility model provides a drill bit that can simultaneously complete drilling and wall protection construction.

[0004] This utility model provides the following technical solution: a drill bit that simultaneously completes drilling and wall protection construction, comprising:

[0005] The drill bit is provided with a partition plate that divides the inner cavity of the drill bit into a slurry cavity and a soil sampling cavity. The soil sampling cavity has a soil sampling port on its side wall, and the slurry cavity has a slurry inlet and a slurry outlet extending to the soil sampling port.

[0006] The rotating sleeve is provided in the slurry chamber. The rotating sleeve is drivenly connected to a rotating shaft, and the rotating shaft is slidably connected to the rotating sleeve. The rotating sleeve is also provided with a positioning sleeve extending into the soil sampling chamber. The rotating shaft is provided with an extension that is slidably connected to the positioning sleeve. The side wall of the positioning sleeve is also provided with a sliding groove. The extension is provided with a pin that slides relative to the sliding groove.

[0007] The hole enlarging device includes a wing plate corresponding to the soil sampling port. The wing plate is rotatably connected to the positioning sleeve, and a connecting rod is hinged between the wing plate and the pin. The end of the wing plate is provided with an expanding tooth. When the extension drives the wing plate to extend outward, the expanding tooth protrudes from the soil sampling port. After the extension drives the wing plate to retract inward, the expanding tooth closes the slurry outlet.

[0008] Preferably, the sidewall of the soil sampling chamber is provided with two soil sampling ports, and the two soil sampling ports are symmetrical about the center of the drill bucket; the number of slurry outlets is the same as the number of soil sampling ports; the number of wing plates is the same as the number of soil sampling ports, and the two wing plates are symmetrical about the center of the drill bucket.

[0009] Preferably, the inner wall of the rotating sleeve is provided with a limiting groove, and the rotating shaft is provided with a limiting pin that is slidably connected to the limiting groove.

[0010] Preferably, the wing plate is close to the left or right side of the soil sampling port.

[0011] Preferably, the partition is a curved panel that is low around the edges and high in the middle, and the slurry outlet is located at the bottom edge of the slurry chamber.

[0012] Preferably, the expanding tooth is provided with a plane or valve core for sealing the slurry outlet.

[0013] The beneficial effects of this utility model are: during drilling, hole enlargement is completed simultaneously, and the excavated soil enters the soil extraction chamber through the soil extraction port to form an annular gap. The slurry outlet is opened to allow the quick-setting slurry to fill the annular gap and form a protective wall. Drilling, hole enlargement, soil extraction, and wall protection are completed simultaneously, which simplifies the construction process, improves construction efficiency, reduces costs, and has low environmental risks. Attached Figure Description

[0014] Figure 1 A schematic diagram of the retraction of the wing plate in one embodiment of the drill bit.

[0015] Figure 2 A schematic diagram of the blade extension in one embodiment of a drill bit.

[0016] Figure 3 This is a schematic diagram illustrating the working principle of a drill bit for hole enlargement.

[0017] Reference numerals: 10, drill bit; 11, partition plate; 20, slurry chamber; 21, slurry outlet; 30, soil sampling chamber; 31, soil sampling port; 40, rotating sleeve; 41, positioning sleeve; 42, chute; 43, limiting chute; 50, rotating shaft; 51, extension; 52, pin; 53, limiting pin; 61, wing plate; 62, connecting rod; 63, expanding tooth. Detailed Implementation

[0018] The embodiments of this utility model will be described in more detail below with reference to the accompanying drawings and reference numerals, so that those skilled in the art can implement them after reading this specification. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0019] This utility model provides, for example Figure 1-3The drill bit shown is capable of simultaneously completing drilling and wall protection construction, including a drill bucket 10 and a hole-reaming device disposed within the drill bucket 10.

[0020] The drill bucket 10 can refer to the existing double-bottom-door drill bucket with a valve at the bottom. In this embodiment, based on the existing technology, a partition 11 is set inside the drill bucket 10 to divide the inner cavity of the drill bucket 10 into a slurry chamber 20 and a soil sampling chamber 30. The soil sampling chamber 30 is used to recover the excavated soil sheared during drilling. Its side wall is provided with two soil sampling ports 31, and the two soil sampling ports 31 are symmetrical about the central axis of the drill bucket 10. Excavated soil can enter the soil sampling chamber 30 through the soil sampling ports 31. The bottom of the soil sampling chamber 30 is also provided with the valve. When the drill bucket 10 is drilling, the excavated soil at the bottom can enter through the valve. When the drill bucket 10 rises, the valve automatically closes and takes the excavated soil out. The slurry chamber 20 is pre-filled with quick-setting slurry for wall protection, which is poured in through the slurry inlet. Two slurry outlets 21 are also provided at the bottom of the slurry chamber 20, extending to the soil extraction port 31, through which the quick-setting slurry can be discharged outside the soil extraction port 31. Preferably, the partition 11 is a curved panel that is low around the edges and high in the middle, and the slurry outlets 21 are located at the bottom edge of the slurry chamber 20 to facilitate the discharge of the quick-setting slurry.

[0021] A rotating sleeve 40 is also provided in the center of the slurry chamber 20. The rotating sleeve 40 is connected to a rotating shaft 50, and the rotary drilling rig drives the drill bucket 10 to rotate through the rotating shaft 50. In this embodiment, the rotating sleeve 40 can have a square cross-section, and the rotating shaft 50 is clearance-fitted with the rotating sleeve 40; in other embodiments, the rotating shaft 50 can also be connected to the rotating sleeve 40 by means of splines, flat keys, etc. The inner wall of the rotating sleeve 40 is also provided with a limiting groove 43, and the rotating shaft 50 is provided with a limiting pin 53 that is slidably connected to the limiting groove 43 to prevent the rotating shaft 50 from dislodging from the rotating sleeve 40.

[0022] The rotating shaft 50 is also slidably connected to the rotating sleeve 40; the rotating sleeve 40 is also provided with a positioning sleeve 41 extending into the soil sampling cavity 30, the bottom of the positioning sleeve 41 is closed, the rotating shaft 50 is provided with an extension 51 slidably connected to the positioning sleeve 41, the side wall of the positioning sleeve 41 is also provided with two sliding grooves 42 symmetrically arranged about the central axis of the positioning sleeve 41, and the extension 51 is provided with a pin 52 that slides relative to the sliding grooves 42. The rotating shaft 50 can drive the extension 51 to move up and down relative to the positioning sleeve 41, and the pin 52 protrudes from the sliding grooves 42 as the rotating shaft of the connecting rod 62.

[0023] The borehole enlargement device includes two wing plates 61 corresponding to the two soil sampling ports 31, respectively. The two wing plates 61 are symmetrical about the central axis of the drill bit 10, and the wing plates 61 are close to the left side of the corresponding soil sampling port 31. Figure 3As shown. The wing plate 61 is rotatably connected to the positioning sleeve 41, and a connecting rod 62 is hinged between the wing plate 61 and the pin 52. The end of the wing plate 61 is provided with an expanding tooth 63, which can refer to the drill teeth in the prior art. Furthermore, the expanding tooth 63 is provided with a plane or valve core for sealing the slurry outlet 21.

[0024] When the drill bit is lowered, if Figure 1 As shown, the drill bit moves downward under gravity, the pin 52 is at the top of the chute 42, the wing plate 61 retracts, and the reaming teeth 63 are inside the drill bit 10, sealing the slurry outlet 21. During downward drilling and reaming, as... Figure 2 As shown, the rotating shaft 50 drives the drill bit to rotate and cut downwards. The soil at its bottom enters the soil extraction chamber 30 through the bottom valve. The rotating shaft 50 presses down, driving the extension 51 to move downwards. Through the connecting rod 62, the wing plate 61 extends outwards. The expanding teeth 63 protrude from the soil extraction port 31, shearing the soil layer to complete the hole enlargement. The generated soil enters the soil extraction chamber 30 from the soil extraction port 31, creating an annular gap, such as... Figure 3 As shown; simultaneously, the slurry outlet 21 is opened, and the quick-setting slurry fills the annular gap in time under the action of centrifugal force and gravity, forming a protective wall. After the soil extraction cavity 30 is filled, the rotating shaft 50 drives the extension 51 to rise, and the connecting rod 62 retracts the wing plate 61 inward until the expanding tooth 63 closes the slurry outlet 21. At the same time, the bottom valve of the soil extraction cavity 30 is closed, and the excavated soil can be carried out of the pile hole with the drill bucket 10.

[0025] Comparing construction schemes for concrete piles in Chengdu, the construction site has a 15m layer of silty clay, 10m of groundwater, a hole depth of 15m, and a hole diameter of 1m. Multiple pile holes were constructed using different methods: mud slurry wall protection, steel cylinder wall protection, and this invention. The mud slurry wall protection method has a single pile cost of 19,100 yuan and a construction period of 2.53 days, with high environmental risks; the steel cylinder wall protection method has a single pile cost of 22,900 yuan and a construction period of 2.50 days, with low environmental risks; this invention has a single pile cost of 15,400 yuan and a construction period of 2.00 days, with low environmental risks.

[0026] The above describes one or more embodiments of this utility model in a relatively specific and detailed manner, but it should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A drill bit for simultaneously completing drilling and lining construction, characterized in that, The utility model relates to a drilling rig, including: a drill pit is provided with a partition plate, and the inner cavity of the drill pit is divided into a slurry cavity and a soil cavity, the sidewall of the soil cavity is provided with a soil outlet, the slurry cavity is provided with a slurry inlet and a slurry outlet extending to the soil outlet; a rotating sleeve is arranged in the slurry cavity, and a rotating shaft is drivingly connected to the rotating sleeve, and the rotating shaft is slidingly connected to the rotating sleeve; the rotating sleeve is further provided with a positioning sleeve extending into the soil cavity, the rotating shaft is provided with an extension part slidingly connected to the positioning sleeve, and the sidewall of the positioning sleeve is further provided with a sliding groove, and the extension part is provided with a pin shaft slidingly connected to the sliding groove; a reaming device includes a wing plate corresponding to the soil outlet, the wing plate is rotationally connected to the positioning sleeve, and a connecting rod is hingedly connected between the wing plate and the pin shaft, the wing plate is provided with a reamer bit at the end, the reamer bit protrudes out of the soil outlet when the extension part drives the wing plate to extend outward, and the reamer bit closes the slurry outlet after the extension part drives the wing plate to retract inward.

2. A drill bit for simultaneous completion drilling and wall protection construction according to claim 1, characterized in that The sidewall of the soil cavity is provided with two soil outlets, and the two soil outlets are centrally symmetric around the central axis of the drill pit; the number of slurry outlets is consistent with the number of soil outlets; the number of wing plates is consistent with the number of soil outlets, and the two wing plates are centrally symmetric around the central axis of the drill pit.

3. A drill bit for simultaneous completion drilling and wall protection construction according to claim 1, characterized in that The inner wall of the rotating sleeve is provided with a limiting sliding groove, and the rotating shaft is provided with a limiting pin slidingly connected to the limiting sliding groove.

4. A drill bit for simultaneous completion drilling and wall protection construction according to claim 1, characterized in that The wing plate is close to the left side or the right side of the soil outlet.

5. A drill bit for simultaneous completion drilling and wall protection construction according to claim 1, characterized in that, The partition plate is a curved plate with low periphery and high middle, and the slurry outlet is arranged at the bottom edge of the slurry cavity.

6. A drill bit for simultaneous completion drilling and wall protection construction according to claim 1, characterized in that The reamer bit is provided with a flat surface or a valve core for closing the slurry outlet.

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