Special-shaped drill bit

Abstract

The utility model discloses a special-shaped drill bit, which relates to the technical field of construction drilling equipment, can be arranged in a pile casing in a penetrating manner, and structurally comprises a sleeve, one end of the sleeve is used for being connected with a drill rod, and the other end of the sleeve is provided with a slag outlet; the special-shaped protective ring is fixedly arranged on the outer side of the sleeve in a sleeving mode, one side of the special-shaped protective ring is of an inwards-concave structure, and the maximum diameter of the special-shaped protective ring is smaller than the inner diameter of the protective cylinder. And the conical cutting edge is obliquely connected between the inner side of the special-shaped retainer and the side wall of the sleeve. According to the special-shaped drill bit, the drill bit can smoothly pass through a deformation area of a pile casing, the diameter of a follow-up drill hole meets the requirement, cost is low, and safety is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to construction drilling equipment technical field, in particular to a special-shaped drill bit. BACKGROUND

[0002] The casing is a tool for drilling bored pile construction operation, and the main functions of the casing during piling include supporting the hole wall, guiding the pile hammer and isolating groundwater. In the casing construction, a drill bit with a circular cross section is generally used to extend into the casing for drilling. The diameter of the drill bit is generally about 20-40 cm smaller than the diameter of the casing. Under normal circumstances, the drill bit can easily pass through the casing, and then continue to drill downward. However, due to changes in geology, it may cause slight deformation and edge curling of the casing, which in turn causes the drill bit to be unable to pass through the deformed area of the casing. If a drill bit with a smaller diameter is replaced, it can successfully pass through the deformed area of the casing, but the subsequent drilling diameter does not meet the preset diameter requirement. In order to solve this problem, in the prior art, a diver underwater cuts off the deformed area of the casing, so that the drill bit can pass through the deformed area smoothly. However, this method is high in cost and high in risk.

[0003] There is an urgent need to design a low-cost and high-safety solution that allows the drill bit to pass through the deformed area of the casing smoothly and the subsequent drilling diameter to meet the requirements. UTILITY MODEL CONTENT

[0004] The utility model aims to provide a special-shaped drill bit to solve the problems existing in the prior art, so that the drill bit can pass through the deformed area of the casing smoothly, the subsequent drilling diameter meets the requirements, and the cost is low and the safety is high.

[0005] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0006] The utility model provides a special-shaped drill bit which can be arranged in the casing and comprises:

[0007] The sleeve has one end connected to the drill rod and the other end provided with a slag outlet;

[0008] The special-shaped retainer ring is fixedly arranged outside the sleeve, one side of the special-shaped retainer ring is concave, and the maximum diameter of the special-shaped retainer ring is smaller than the inner diameter of the casing;

[0009] The conical cutting edge is obliquely connected between the inner side of the special-shaped retainer ring and the side wall of the sleeve.

[0010] Preferably, the special-shaped retainer ring comprises an integral semicircular ring part and a recessed part, the semicircular ring part is arranged around the outside of the sleeve, and the two side edges of the recessed part are fixedly connected to the corresponding side edges of the semicircular ring part at one end and fixedly connected to the side wall of the sleeve at the other end.

[0011] Preferably, two side edges of the recess are symmetrically arranged and are both smooth arc structures.

[0012] Preferably, a reinforcing rib plate is arranged at the position where the side edge of the recess is connected with the sleeve.

[0013] Preferably, a portal is fixedly arranged at one end of the sleeve close to the slag outlet, the portal comprises two symmetrically fixed support plates on the side wall of the sleeve, and an arc-shaped beam plate is fixedly connected at the end of the support plates and is located below the slag outlet.

[0014] Preferably, a plurality of cutting teeth are fixedly arranged at the side of the arc-shaped beam plate away from the slag outlet.

[0015] Preferably, the conical cutting edge comprises a vertical cutting plate fixedly connected between the sleeve and the retainer, and a plurality of cutting teeth are uniformly arranged on the bottom edge of the vertical cutting plate.

[0016] Preferably, a plurality of supporting rods are used to fixedly connect the sleeve and the special-shaped retainer.

[0017] Preferably, the maximum diameter of the special-shaped retainer is 20-40 cm smaller than the inner diameter of the sleeve.

[0018] Preferably, a female screw is fixedly arranged at one end of the sleeve away from the slag outlet, and the female screw can be fixedly connected with a male screw at the end of the drill rod.

[0019] The present application has the following technical effects compared with the prior art.

[0020] The overall cross section of the present application is a special-shaped structure, one side of which is concave, and the maximum diameter of the present application is the same as the diameter of the existing drill bit. When slight deformation occurs on one side of a certain area of the sleeve, the position of the present application in the sleeve can be adjusted so that the concave structure thereof is directly opposite the deformed position, thereby enabling the present application to smoothly pass through the deformed area. Since the maximum diameter of the special-shaped drill bit is the same as the diameter of the required conventional drill bit, the borehole inner diameter meets the requirements during the rotation drilling process after the special-shaped drill bit is started. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 is a top view schematic diagram of the special-shaped drill bit in one or some embodiments of the present application;

[0023] Figure 2 is a schematic view of the profiled drill bit in a top view for one or some embodiments of the present application;

[0024] Figure 3 is a schematic view of the profiled drill bit in a partial cross-sectional view for one or some embodiments of the present application.

[0025] In the figure: 1 - sleeve, 2 - profiled retainer, 201 - semicircular ring part, 202 - recessed part, 3 - support rod, 4 - buckle, 5 - conical cutting edge, 501 - vertical cutting plate, 6 - support plate, 7 - arc beam plate, 8 - cutting tooth, 9 - slag outlet. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the ordinary skilled in the art without creative labor fall within the protection scope of the present application.

[0027] The present application aims to provide a profiled drill bit to solve the problems in the prior art, so that the drill bit can smoothly pass through the deformation area of the casing, the subsequent drilling diameter meets the requirements, and the cost is low and the safety is high.

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0029] The casing is a tool for drilling bored pile construction operation. The main functions of the casing during piling include supporting the hole wall, guiding the pile hammer and isolating groundwater, and the specific functions are as follows:

[0030] Supporting the hole wall. In soft soil layers such as silt soil or loose sandy soil, the self-stability of the soil body is poor. The steel casing can effectively resist the lateral pressure of the surrounding soil body by virtue of its rigid structure, thereby preventing the hole wall from collapsing.

[0031] Guiding the pile hammer. The casing has an accurate inner diameter size, which can provide accurate guidance for the pile hammer. During piling, the pile hammer impacts the pile body along the inner wall of the steel casing, so that the pile can sink into the ground according to the designed verticality and position.

[0032] The casing is good in sealing property and can effectively isolate underground water from the construction area in the pile hole. In the area with high underground water level, the inflow of underground water can dilute the mud in the pile hole, reduce the wall protection property of the mud and cause the hole wall to collapse. After the casing is inserted into the ground, a barrier is formed to prevent the inflow of underground water and ensure the stability of the mud in the pile hole and the stability of the hole wall.

[0033] In actual use, the casing can be deformed at a position along the axial direction. The casing is made of steel and thus the deformed position and the deformed area are not too large. The deformed area is concave or curled at one side or one point. Although the deformation of the deformed area is only at one position and the deformation size is generally small, the whole cross section of the matched drill bit with a circular shape cannot pass through the deformed area from top to bottom.

[0034] To solve the above technical problems, the utility model provides a special-shaped drill bit, which can be arranged in the casing and comprises a sleeve 1 and a special-shaped ring 2. Figure 1 , Figure 2 , Figure 3 The sleeve 1 is fixedly connected with the special-shaped ring 2 through a plurality of supporting rods 3. One end of the sleeve 1 is used for connecting a drill rod, and the other end is provided with a slag outlet 9. The special-shaped ring 2 is fixedly arranged outside the sleeve 1. One side of the special-shaped ring 2 is concave. No supporting rod 3 is arranged at the position of the concave structure. The maximum diameter of the special-shaped ring 2 is smaller than the inner diameter of the casing. A conical cutting edge 5 is obliquely connected between the inner side of the special-shaped ring 2 and the side wall of the sleeve 1. The higher end of the conical cutting edge 5 is fixedly connected with the inner side wall of the special-shaped ring 2. The lower end of the conical cutting edge 5 is obliquely extended to the side wall position of the sleeve 1 near the slag outlet 9 and is fixedly connected.

[0035] In order to make the utility model can smoothly pass through the deformation area of the casing, so the special-shaped retainer ring 2 of the embodiment includes an integral semicircular ring part 201 and a recessed part 202, the recessed part 202 is formed into a concave structure;The semicircular ring part 201 is annularly arranged on the outside of the sleeve 1, the two side edges of the recessed part 202 are fixedly connected with the corresponding side edges of the semicircular ring part 201, the semicircular ring part 201 and the recessed part 202 are integrally formed into a special-shaped annular structure, the other end of the recessed part 202 is fixedly connected with the side wall of the sleeve 1, the two side edges of the recessed part 202 in the embodiment are symmetrically arranged and are both smooth arc structures, in the plan view, the two side edges of the recessed part 202 are similar to a “herringbone” structure, in order to make the connection more firm, a reinforcing rib plate is arranged at the position where the side edge of the recessed part 202 is connected with the sleeve 1.Thereby, in use, the special-shaped drill bit can be stationary and penetrated into the casing, the recessed part 202 is opposite to the deformation position of the casing, due to the concave structure of the recessed part 202, interference with the edge folding of the deformation position of the casing can not occur, and the deformation area can be smoothly passed through.The maximum diameter of the special-shaped retainer ring 2 of the embodiment is 20-40cm smaller than the inner diameter of the casing, which is the same as the size of the existing circular drill bit, and the one end of the conical cutting edge 5 is fixedly connected with the inner side wall at the maximum diameter position of the special-shaped retainer ring 2, so that the inner diameter of the drilled hole opened by the conical cutting edge 5 after rotation is the same as that of the existing circular drill bit, meeting the drilling requirements.

[0036] In order to make the drilling process slag can smoothly enter the slag outlet 9, so the embodiment is fixedly provided with a portal at the end of the sleeve 1 close to the slag outlet 9, the portal includes two symmetrical support plates 6 fixedly arranged on the side wall of the sleeve 1, the end of the support plate 6 is fixedly connected with an arc-shaped beam plate 7, the arc-shaped beam plate 7 is located below the slag outlet 9, and a plurality of cutting teeth 8 are fixedly arranged on the side of the arc-shaped beam plate 7 away from the slag outlet 9, so that the cutting teeth 8 at the arc-shaped beam plate 7 can also assist in drilling during the rotation of the special-shaped drill bit.

[0037] The conical cutting edge 5 of the embodiment includes a vertical cutting plate 501 fixedly connected between the sleeve 1 and the retainer ring, and a plurality of cutting teeth 8 are uniformly arranged on the bottom edge of the vertical cutting plate 501.The half of the special-shaped retainer ring 2 of the special-shaped drill bit of the utility model is a concave structure, so that the overall cross section is artificially reduced in the stationary state, in another embodiment, the special-shaped retainer ring 2 can also be designed as an elliptical structure, the major axis dimension of which is the same as the diameter dimension of the existing drill bit, so that the minor axis position is artificially narrowed, and the one end of the conical cutting edge 5 is connected with the side wall of the major axis end of the elliptical structure, so that the rotation thereof can also keep the original cutting diameter as the existing drill bit.

[0038] In order to make the utility model can be fixedly connected with the drill rod, so that the sleeve 1 is fixedly provided with the buckle female 4 away from the one end of the slag outlet 9, it can be fixedly connected with the buckle male thread of the end of the drill rod. When using, the utility model structure is used to construction to the deformation position of the casing, then the smaller size drill bit is changed, and the drill bit is passed through the lower two meters position of the deformation area of the casing, then the special-shaped drill bit of the utility model is changed back, the special-shaped drill bit is appropriately adjusted to rotate, the concave structure is opposite to the deformation position of the casing, so that the casing deformation area is not hindered, the casing deformation position can be passed through, then the special-shaped drill bit is started, and the position below the casing deformation area is normally constructed, until the hole is formed. After the hole is formed, the special-shaped drill bit needs to be lifted carefully, the position is correctly found, the concave structure is opposite to the deformation position of the casing, and the special-shaped drill bit is taken out. Since the shape of the special-shaped drill bit is changed, the special-shaped drill bit can also pass through easily when the casing is deformed, the drilling operation is completed, the process of underwater cutting is avoided, the depth of the deformation position of some casings is deeper, and the range of the diving operation is limited. And some geology is just the position protected by the casing, and cutting is not allowed, otherwise the significance of the casing is lost and a new construction risk point is caused. The utility model adopts the scheme, does not need to cut the deformation position of the casing, improves the safety of the drilling pile construction operation, and also reduces the cost.

[0039] The principle and implementation mode of the utility model are described by applying specific examples in the utility model, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, according to the idea of the utility model, the specific implementation mode and application range will be changed by the general technical personnel in the field. According to the above, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A profiled drill bit capable of being deployed within a casing, characterised in that: The utility model relates to a drill rod cutting device, including: a sleeve, one end of which is used for connecting a drill rod, and the other end of which is provided with a slag outlet; a special-shaped retainer ring, which is fixedly sleeved outside the sleeve, one side of the special-shaped retainer ring being a concave structure, and the maximum diameter of the special-shaped retainer ring being smaller than the inner diameter of the sleeve; a conical cutting edge, which is obliquely connected between the inner side of the special-shaped retainer ring and the side wall of the sleeve.

2. The modified bit of claim 1, wherein: The special-shaped retainer ring comprises an integral semicircular ring part and a recessed part, the semicircular ring part being annularly arranged outside the sleeve, and the two side edges of the recessed part being fixedly connected to the corresponding side edges of the semicircular ring part at one end and to the side wall of the sleeve at the other end.

3. The modified bit of claim 2, wherein: The two side edges of the recessed part are symmetrically arranged and are both smooth arc structures.

4. The modified profile drill bit of claim 3, wherein: The side edges of the recessed part are provided with reinforcing rib plates at the positions connected to the sleeve.

5. The modified bit of claim 1, wherein: The sleeve is fixedly provided with a portal near the end close to the slag outlet, the portal comprising two symmetrical support plates fixedly arranged on the side wall of the sleeve, the end of each support plate being fixedly connected to an arc-shaped beam plate, and the arc-shaped beam plate being located below the slag outlet.

6. The profile drill bit of claim 5, wherein: A plurality of cutting teeth are fixedly arranged on the side of the arc-shaped beam plate away from the slag outlet.

7. The modified bit of claim 1, wherein: The conical cutting edge comprises a vertical cutting plate fixedly connected between the sleeve and the retainer ring, and a plurality of cutting teeth are uniformly arranged on the bottom edge of the vertical cutting plate.

8. The modified bit of claim 1, wherein: The sleeve and the special-shaped retainer ring are fixedly connected by a plurality of supporting rods.

9. The modified bit of claim 6 wherein: The maximum diameter of the special-shaped retainer ring is 20-40 cm smaller than the inner diameter of the sleeve.

10. The modified bit of claim 1, wherein: A female buckle is fixedly arranged on the end of the sleeve away from the slag outlet, and the female buckle can be fixedly connected to the male screw thread at the end of the drill rod.

Images