Twist drill for geotechnical investigation

Abstract

The utility model discloses a twist drill for geotechnical investigation, which relates to the technical field of geotechnical investigation tools, and comprises a shell, a labor-saving driving mechanism is mounted in the shell, a T-shaped handle is fixedly connected to the top of the shell, an extension rod is mounted below the shell, a drill rod is in threaded connection with the tail end of the extension rod, and the drill rod is in threaded connection with the tail end of the extension rod. A threaded drill bit is fixedly connected to the tail end of the drill rod, the labor-saving driving mechanism comprises a connecting rod and a rotating rod, a large gear is fixedly connected to the outer end of the connecting rod, a small gear is fixedly connected to the outer end of the rotating rod, and a Z-shaped handle is movably connected to one side of the shell in a penetrating mode. The end, located in the shell, of the Z-shaped handle is fixedly connected with a first bevel gear, and the outer end of the rotating rod is fixedly connected with a second bevel gear. Under the condition that the rough shape of an original twist drill is not changed, the labor-saving driving mechanism is additionally arranged, so that the torque is increased in the pressing process, the twist drill can easily enter soil under the complex soil filling condition, and the exploration efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical exploration tools, in particular to a twist drill for geotechnical exploration. Background Art

[0002] During the geotechnical exploration of municipal roads and pipeline projects, the composition, distribution, and physical and mechanical properties of shallow soil layers, especially artificial fill, have an important impact on pipeline design schemes and construction techniques. When conducting geotechnical exploration, a twist drill, also called a manual drill, is usually used. Its main shape is T-shaped. When in use, a worker rotates and presses it down simultaneously to drill it into the soil and rock.

[0003] However, traditional twist drills have problems of laborious operation and low efficiency in cases where the composition of the fill is complex and the manual screwing and pressing is difficult. Therefore, there is an urgent need for a new tool that can increase torque and facilitate the twist drill to penetrate the soil to improve the exploration efficiency and accuracy.

[0004] For this reason, this application proposes a twist drill for geotechnical exploration to solve the above problems. Content of the Utility Model

[0005] The utility model provides a twist drill for geotechnical exploration to solve the above technical problems.

[0006] To solve the above technical problems, a twist drill for geotechnical exploration provided by the utility model includes a housing. A labor-saving driving mechanism is installed inside the housing. A T-shaped handle is fixedly connected to the top of the housing. An extension rod is installed below the housing. A drill rod is threadedly connected to the end of the extension rod. A threaded drill bit is fixedly connected to the end of the drill rod. The labor-saving driving mechanism includes a connecting rod and a rotating rod. Both the connecting rod and the rotating rod are movably connected inside the housing through bearings, and the rotating rod is located on one side of the connecting rod. The top end of the extension rod and the bottom of the connecting rod are threadedly connected. A large gear is fixedly connected to the outer end of the connecting rod. A small gear is fixedly connected to the outer end of the rotating rod. The large gear and the small gear mesh with each other. A Z-shaped handle is movably connected through the side of the housing. One end of the Z-shaped handle located inside the housing is fixedly connected to a first bevel gear. A second bevel gear is fixedly connected to the outer end of the rotating rod. The first bevel gear and the second bevel gear mesh with each other.

[0007] Preferably, the second bevel gear is located above the small gear, and the connecting rod is located inside the housing and extends to the bottom of the housing.

[0008] Preferably, the connection part between the side of the housing and the Z-shaped handle is thickened, and the housing and the Z-shaped handle are movably connected through a bearing.

[0009] Preferably, the length of the threaded drill bit is 30 cm, and the cross-sectional diameter of the threaded drill bit is larger than that of the drill pipe, and the extension rod and the drill pipe have the same diameter.

[0010] Compared with the related art, a twist drill for geotechnical investigation provided by the utility model has the following beneficial effects:

[0011] 1. Without changing the general shape of the original twist drill, by adding a labor-saving driving mechanism, the torque is increased during the downward pressing process, enabling the twist drill to easily penetrate the soil under complex filling conditions and improving the investigation efficiency;

[0012] 2. Due to the increase in torque, the operator can achieve the deep penetration of the twist drill without excessive force, effectively saving physical strength and reducing the labor intensity;

[0013] 3. This twist drill is particularly suitable for the investigation of shallow urban soils where the site is narrow, the working surface is small, it is difficult for the drilling rig to construct, and there are high requirements for noise control, and the applicable range is relatively wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of a twist drill for geotechnical investigation proposed by the utility model;

[0015] Figure 2 is a schematic front view of the inside of the housing of a twist drill for geotechnical investigation proposed by the utility model;

[0016] Figure 3 is a partial explosion view of a twist drill for geotechnical investigation proposed by the utility model.

[0017] Reference numerals in the figures: 1, housing; 2, T-shaped handle; 3, extension rod; 4, drill pipe; 5, threaded drill bit; 6, connecting rod; 7, large gear; 8, rotating rod; 9, small gear; 10, Z-shaped handle; 11, first bevel gear; 12, second bevel gear. DETAILED DESCRIPTION OF THE INVENTION

[0018] Example, consisting of Figures 1-3Provided, the utility model includes a housing 1, an effort-saving driving mechanism is installed inside the housing 1, a T-shaped handle 2 is fixedly connected to the top of the housing 1, an extension rod 3 is installed below the housing 1, the end of the extension rod 3 is threadedly connected to a drill rod 4, the end of the drill rod 4 is fixedly connected to a threaded drill bit 5, the effort-saving driving mechanism includes a connecting rod 6 and a rotating rod 8, the connecting rod 6 and the rotating rod 8 are both movably connected inside the housing 1 through bearings, and the rotating rod 8 is located on one side of the connecting rod 6, the top end of the extension rod 3 and the bottom of the connecting rod 6 are threadedly connected, a large gear 7 is fixedly connected to the outer end of the connecting rod 6, a small gear 9 is fixedly connected to the outer end of the rotating rod 8, the large gear 7 and the small gear 9 are meshed with each other, one side of the housing 1 is movably connected through and penetrated by a Z-shaped handle 10, one end of the Z-shaped handle 10 located inside the housing 1 is fixedly connected to a first bevel gear 11, a second bevel gear 12 is fixedly connected to the outer end of the rotating rod 8, and the first bevel gear 11 and the second bevel gear 12 are meshed with each other.

[0019] During operation, two workers are required to work simultaneously. Then, the two workers jointly hold the T-shaped handle 2. When the workers hold the T-shaped handle 2, neither the workers nor the T-shaped handle 2 needs to rotate. Only one of the workers needs to rotate the Z-shaped handle 10 with one hand, and then the threaded drill bit 5 can be driven to rotate with less effort through the effort-saving driving mechanism. Then, as the worker holds the T-shaped handle 2 and presses downwards, the threaded drill bit 5 can be rotated and drilled down into the rock and soil. Each time it drills 30 cm, and then the entire threaded drill bit 5 is lifted out of the rock and soil. The rock and soil samples corresponding to the depth can be carried out by the thread gap on the outer surface of the threaded drill bit 5 for observing the rock and soil conditions. After the preliminary observation, the threaded drill bit 5 can be put back into the original drill hole and then continue to drill 30 cm and lift out the observed soil sample again. By repeating the operation, the rock and soil conditions at different depths can be gradually explored.

[0020] The second bevel gear 12 is located above the small gear 9. The connecting rod 6 is located inside the housing 1 and extends to the bottom of the housing 1. The second bevel gear 12 being located above the small gear 9 can avoid the interference problem when the two operate on the rotating rod 8. And the connecting rod 6 extends out from the bottom of the housing 1, which is convenient for threadedly connecting the extension rod 3. One or more extension rods 3 can be selected and assembled according to requirements to facilitate the exploration of rock and soil at different depths.

[0021] The connection between one side of the housing 1 and the Z-shaped handle 10 is thickened, and the housing 1 and the Z-shaped handle 10 are movably connected through a bearing. The thickening treatment at the connection between the housing 1 and the Z-shaped handle 10 can make the position between the two more stable and avoid the problem of the Z-shaped handle 10 tilting when rotating. And the bearing connection method can reduce the resistance when the Z-shaped handle 10 rotates, making the operation more labor-saving.

[0022] The length of the threaded drill bit 5 is 30 cm, and the cross-sectional diameter of the threaded drill bit 5 is larger than that of the drill pipe 4. The extension rod 3 and the drill pipe 4 have the same diameter. The thread depth and pitch on the outer surface of the threaded drill bit 5 are relatively large. Therefore, when the threaded drill bit 5 drills downward, the rock and soil can be carried out in the gaps between its thread teeth. The diameter of the threaded drill bit 5 is larger than that of the drill pipe 4 and the extension rod 3, so that the inner wall of the borehole drilled by the threaded drill bit 5 will not contact the outer walls of the drill pipe 4 and the extension rod 3. When the threaded drill bit 5 is lifted out, there is only the resistance caused by the friction between the outer wall of the threaded drill bit 5 and the inner wall of the borehole. The drill pipe 4 and the extension rod 3 will not contact the inner wall of the borehole, and thus no extra frictional resistance will be caused. The threaded drill bit 5 can be more easily and labor-savingly lifted out of the borehole.

[0023] Working principle:

[0024] During the geotechnical exploration operation, two workers can respectively hold both ends of the T-shaped handle 2 to make the threaded drill bit 5 perpendicular to the ground. Then, one of the workers holds the Z-shaped handle 10 and rotates it. When the Z-shaped handle 10 rotates, it can drive the rotating rod 8 to rotate through the meshing transmission of the first bevel gear 11 and the second bevel gear 12. When the rotating rod 8 rotates, it can drive the connecting rod 6 to rotate through the meshing transmission of the small gear 9 and the large gear 7. Since the diameter of the small gear 9 is smaller than that of the large gear 7, the large gear 7 will rotate one circle only after the small gear 9 rotates several circles. Therefore, it is more labor-saving to rotate the Z-shaped handle 10 to drive the connecting rod 6 to rotate. When the connecting rod 6 rotates, it will drive the extension rod 3, the drill pipe 4 and the threaded drill bit 5 to rotate synchronously. While driving the threaded drill bit 5 to rotate, the worker also holds the T-shaped handle 2 and presses downward so that the threaded drill bit 5 rotates and moves downward into the rock and soil. After drilling 30 cm, stop rotating and lift the threaded drill bit 5 out of the rock and soil, and observe the rock and soil samples carried in the thread teeth of the threaded drill bit 5 to achieve the purpose of geotechnical exploration. After observing the rock and soil in this section, repeat the above operation to insert the threaded drill bit 5 back into the original drill hole and continue to drill downward for 30 cm, and then lift it out to observe the rock and soil samples carried in the thread teeth of the threaded drill bit 5. Repeat the operation subsequently to explore the rock and soil conditions at different depths.

Claims

1. A twist drill for geotechnical investigation, comprising a housing (1), characterized in that: A labor-saving driving mechanism is installed inside the housing (1); a T-shaped handle (2) is fixedly connected to the top of the housing (1); an extension rod (3) is installed below the housing (1); a drill rod (4) is threadedly connected to the end of the extension rod (3); a threaded drill bit (5) is fixedly connected to the end of the drill rod (4); the labor-saving driving mechanism comprises a connecting rod (6) and a rotating rod (8); the connecting rod (6) and the rotating rod (8) are both movably connected to the inside of the housing (1) via bearings, and the rotating rod (8) is located on one side of the connecting rod (6); the top of the extension rod (3) and the rotating rod (8) are connected to the housing (1); The bottom of the connecting rod (6) is threadedly connected, the outer end of the connecting rod (6) is fixedly connected to a large gear (7), the outer end of the rotating rod (8) is fixedly connected to a small gear (9), the large gear (7) and the small gear (9) are meshed with each other, a Z-shaped handle (10) is movably connected through one side of the shell (1), one end of the Z-shaped handle (10) located inside the shell (1) is fixedly connected to a first bevel gear (11), the outer end of the rotating rod (8) is fixedly connected to a second bevel gear (12), and the first bevel gear (11) and the second bevel gear (12) are meshed with each other.

2. A twist drill for geotechnical exploration according to claim 1, characterized in that: The second bevel gear (12) is located above the pinion gear (9), and the connecting rod (6) is located inside the housing (1) and extends to the bottom of the housing (1).

3. The twist drill for geotechnical exploration according to claim 1, characterized in that: The connection between one side of the shell (1) and the Z-shaped handle (10) is thickened, and the shell (1) and the Z-shaped handle (10) are movably connected via a bearing.

4. A twist drill for geotechnical investigation according to claim 1, characterized in that: The length of the threaded drill bit (5) is 30 cm, and the cross-sectional diameter of the threaded drill bit (5) is larger than the cross-sectional diameter of the drill rod (4), and the extension rod (3) and the drill rod (4) have the same diameter.

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