A locally expandable reamer for use in geological drilling

Abstract

The application belongs to the technical field of geological drilling bits, and particularly relates to a locally expandable reaming bit in a geological drilling hole, which comprises a drill rod and an expansion pipe. The expansion pipe is fixedly connected to the left side of the drill rod. A connecting device and a drilling expansion structure are arranged in the expansion pipe. The connecting device comprises a conductive drill rod base, a right screw thread, a conductive drill rod, an inverse screw thread, a cross joint, and a sliding sleeve. The drilling expansion structure comprises a guide shaft, a cross joint slot, a connecting rod, a sliding slot, an extrusion sliding block, a reaming cutter, a spring, a triangular sliding block, and a cutter outlet. The locally expandable reaming bit in the geological drilling hole is provided with a drill bit thread at the bottom of the expansion pipe, so that the connection between the drill bit and the expansion pipe is firm and stable. The outer surface of the expansion pipe is provided with spiral blades. When the drill bit rotates, the cut rock and soil is transmitted to the ground along the spiral blades under the action of the drill bit rotation, so that no residual soil exists in the hole, and the quality of the pile is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geological drilling bits, in particular to a locally expandable reaming bit in a geological drilling hole. BACKGROUND

[0002] In order to improve the bearing capacity of the foundation, many foundations of buildings adopt pile foundation construction. Rotary drilling piles are widely used in urban construction projects due to their safety, speed, high precision, low noise, environmental protection, high single-pile bearing capacity, and convenient construction.

[0003] However, in a variety of complex soil environments, the ordinary drill bit drilled pile pressure bearing capacity is insufficient, at this time in order to meet the construction and construction needs to use reaming bit to ream, the commonly used reaming bit is mainly mechanical, there are upper and lower opening types, and the opening mechanism is generally four-bar linkage, but this drill bit is a professional reaming bit, which needs to be drilled to the appropriate depth before the four-bar linkage reaming bit is used in many construction environments. This way takes a long time to construct, and if not coordinated, there will be a long waiting period, which seriously slows down the construction efficiency and lengthens the construction time.

[0004] Therefore, we propose a locally expandable reaming bit in a geological drilling hole to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a locally expandable reaming bit in a geological drilling hole to solve the problems raised in the background art.

[0006] To achieve the above purpose, the present application provides the following technical scheme: a locally expandable reaming bit in a geological drilling hole, comprising a drill rod and an expansion pipe, the expansion pipe is fixedly connected to the left side of the drill rod, and the inside of the expansion pipe is provided with a connecting device and a drilling expansion structure.

[0007] The connecting device comprises a conductive drill rod base, a right thread, a conductive drill rod, a reverse thread, a cross plug, and a sliding sleeve, the conductive drill rod base is fixedly connected to the left side of the drill rod, the right thread is opened in the inside of the conductive drill rod base, the conductive drill rod is threadedly connected to the inside of the conductive drill rod base, the reverse thread is opened on the outer surface of the plug-in conductive drill rod, the cross plug is fixedly connected to the left side top of the plug-in conductive drill rod, and the sliding sleeve is arranged outside the cross plug.

[0008] Preferably, the drill hole expansion structure includes a guide shaft, a cross insertion slot, a connecting rod, a squeezing slider, a reamer, a spring, a triangular slider, and a reamer outlet, the guide shaft is arranged at the inner center of the expansion pipe, the cross insertion slot is arranged in the inner part of the guide shaft, the connecting rod is fixedly connected to the left outer surface center of the guide shaft, the squeezing slider is fixedly connected to the left outer surface of the guide shaft and movably connected to the right outer surface of the connecting rod, the reamer is movably connected to the left upper surface of the squeezing slider, the spring is fixedly connected to the left outer surface of the squeezing slider and surrounds the left outer surface of the connecting rod, the triangular slider is fixedly connected to the left inner wall of the expansion pipe, and the reamer outlet is arranged on the left upper surface of the expansion pipe.

[0009] Preferably, the outer surface of the expansion pipe is surrounded by a spiral blade, and the bottom of the expansion pipe is provided with a drill bit thread connection, so that the drill bit and the expansion pipe are firmly and stably connected.

[0010] Preferably, the guide shaft, the cross insertion slot, the connecting rod, the squeezing slider, the conductive drill rod, the reverse thread, and the cross insertion joint are arranged in the inner part of the sliding sleeve.

[0011] Preferably, the two ends of the connecting rod are fixedly connected to the left outer surface center of the guide shaft and the left inner wall center of the expansion pipe, respectively.

[0012] Preferably, the number of the reamers is two, and the two reamers are symmetrically distributed on the upper and lower outer surfaces of the squeezing slider with the center line of the squeezing slider as the axis, so that the hole is better widened.

[0013] Preferably, the number of the triangular sliders is two, and the other triangular slider is fixedly connected to the lower left inner wall of the expansion pipe, and the number of the reamer outlets is two, and the other reamer outlet is arranged on the left lower surface of the expansion pipe.

[0014] Compared with the prior art, the beneficial effects of the present application are as follows: when the device is used, because the conductive drill rod base and the conductive drill rod are threadedly connected, the conductive drill rod is unscrewed, the cross insertion joint is aligned with the cross insertion slot in the inner part of the guide shaft, the two are inserted, and the squeezing slider is slid leftward, while the squeezing slider squeezes the spring leftward, the reamer is also slid leftward, smoothly slides along the triangular slider, and slides to the outer surface of the expansion pipe through the reamer outlet, so that the hole is widened, and the spring also plays a protection and buffering role, when the construction is completed, the spring resets and drives the reamer to retract into the expansion pipe, which is convenient and fast and improves the construction efficiency, and the drill bit thread connection at the bottom of the expansion pipe ensures the firm and stable connection of the drill bit and the expansion pipe. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a front view structural schematic diagram of the present application.

[0016] Figure 2 It is the schematic diagram of the front view cross-section structure of the connecting device of the application;

[0017] Figure 3 It is the schematic diagram of the front view cross-section structure of the borehole expanding structure of the application;

[0018] Figure 4 It is the schematic diagram of the front view cross-section structure of the connecting device of the application.

[0019] In the figure: 1, drill rod; 2, expanding pipe; 3, connecting device; 301, conductive drill rod base; 302, right thread; 303, conductive drill rod; 304, reverse thread; 305, cross plug; 306, sliding sleeve; 4, borehole expanding structure; 401, guide shaft; 402, cross plug slot; 403, connecting rod; 404, extrusion sliding block; 405, reaming cutter; 406, spring; 407, triangular sliding block; 408, cutter outlet; 5, drill bit thread. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the application will be apparently and completely described below with the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all the other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the application.

[0021] Please refer to Figures 1-4 The application provides a technical solution: a locally expandable reaming drill bit in a geological borehole, which comprises a drill rod 1 and an expanding pipe 2, the expanding pipe 2 is fixedly connected to the left side of the drill rod 1, and the inside of the expanding pipe 2 is provided with a connecting device 3 and a borehole expanding structure 4.

[0022] The connecting device 3 comprises a conductive drill rod base 301, a right thread 302, a conductive drill rod 303, a reverse thread 304, a cross plug 305, and a sliding sleeve 306, the conductive drill rod base 301 is fixedly connected to the left side of the drill rod 1, the right thread 302 is opened in the inside of the conductive drill rod base 301, the conductive drill rod 303 is threadedly connected to the inside of the conductive drill rod base 301, the reverse thread 304 is opened on the outer surface of the conductive drill rod 303, the cross plug 305 is fixedly connected to the left side top of the conductive drill rod 303, the sliding sleeve 306 is arranged outside the cross plug 305, and the guide shaft 401, the cross plug slot 402, the connecting rod 403, the extrusion sliding block 404, the conductive drill rod 303, the reverse thread 304, and the cross plug 305 are all arranged inside the sliding sleeve 306.

[0023] The drill hole expansion structure 4 comprises a guide shaft 401, a cross insertion slot 402, a connecting rod 403, an extrusion sliding block 404, a reamer 405, a spring 406, a triangular sliding block 407 and a cutter outlet 408. The guide shaft 401 is arranged in the inner center of the expansion pipe 2, the cross insertion slot 402 is arranged in the inner center of the guide shaft 401, the connecting rod 403 is fixedly connected to the left outer surface center of the guide shaft 401, the two ends of the connecting rod 403 are fixedly connected to the left outer surface center of the guide shaft 401 and the left inner wall center of the expansion pipe 2 respectively, the extrusion sliding block 404 is fixedly connected to the left outer surface of the guide shaft 401 and movably connected to the right outer surface of the connecting rod 403, the reamer 405 is movably connected to the upper left surface of the extrusion sliding block 404, the number of the reamer 405 is two, the two reamers 405 are symmetrically arranged on the upper and lower outer surfaces of the extrusion sliding block 404 with the center line of the extrusion sliding block 404 as the axis, the spring 406 is fixedly connected to the left outer surface of the extrusion sliding block 404 and surrounds the left outer surface of the connecting rod 403, the triangular sliding block 407 is fixedly connected to the left inner wall of the expansion pipe 2, the number of the triangular sliding block 407 is two, the other triangular sliding block 407 is fixedly connected to the lower left inner wall of the expansion pipe 2, the cutter outlet 408 is arranged on the left upper surface of the expansion pipe 2, the number of the cutter outlet 408 is two, the other cutter outlet 408 is arranged on the left lower surface of the expansion pipe 2, and the reamer 405 is discharged through the cutter outlet 408. A drill bit thread 5 is arranged at the bottom of the expansion pipe 2, the drill bit is connected through the thread, and the firm and stable connection of the drill bit and the expansion pipe 2 is ensured.

[0024] In use, when the device is used, because the conductive drill rod base 301 and the conductive drill rod 303 are threadedly connected, the conductive drill rod 303 is unscrewed, the cross insertion head 305 is aligned with the cross insertion slot 402 in the inner center of the guide shaft 401, the two are inserted, the extrusion sliding block 404 is slid leftwards, the spring 406 is extruded leftwards by the extrusion sliding block 404, the reamer 405 is also slid leftwards, smoothly slides along the triangular sliding block 407, slides to the outer surface of the expansion pipe 2 through the cutter outlet 408, and the purpose of reaming is achieved, and the spring 406 also plays a protection and buffering role. When the construction is completed, the spring 406 is reset, the reamer 405 is retracted into the expansion pipe 2, the construction is convenient and fast, the construction efficiency is improved, the drill bit thread 5 is arranged at the bottom of the expansion pipe 2, the firm and stable connection of the drill bit and the expansion pipe 2 is ensured.

[0025] It is to be noted that, as used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component" can include a combination of two or more components. Additionally, the terms "comprise," "comprises," and "comprising," or any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, unless otherwise indicated herein, the terms "first," "second," "third," etc., are not intended to denote a physical order, quantity, or importance, but rather are used for the purpose of nomenclature.

Claims

1. A locally expandable reamer bit in a geological borehole, comprising a drill rod (1) and an expansion tube (2), the expansion tube (2) being fixedly connected to the left side of the drill rod (1), characterized in that: The inside of the expansion pipe (2) is provided with a connecting device (3) and a borehole expansion structure (4); The connecting device (3) comprises a conductive drill rod base (301), a positive thread (302), a conductive drill rod (303), a reverse thread (304), a cross plug (305), and a sliding sleeve (306). The conductive drill rod base (301) is fixedly connected to the left side of the drill rod (1). The positive thread (302) is arranged in the inside of the conductive drill rod base (301). The conductive drill rod (303) is threadedly connected to the inside of the conductive drill rod base (301). The reverse thread (304) is arranged on the outer surface of the conductive drill rod (303). The cross plug (305) is fixedly connected to the left top of the conductive drill rod (303). The sliding sleeve (306) is arranged on the outside of the cross plug (305). The borehole expansion structure (4) comprises a guide shaft (401), a cross plug slot (402), a connecting rod (403), an extrusion sliding block (404), a reaming cutter (405), a spring (406), a triangular sliding block (407), and a cutter outlet (408). The guide shaft (401) is arranged in the inside center of the expansion pipe (2). The cross plug slot (402) is arranged in the inside of the guide shaft (401). The connecting rod (403) is fixedly connected to the left outer surface center of the guide shaft (401). The extrusion sliding block (404) is fixedly connected to the left outer surface of the guide shaft (401) and movably connected to the right outer surface of the connecting rod (403). The reaming cutter (405) is movably connected to the upper left side of the extrusion sliding block (404). The spring (406) is fixedly connected to the left outer surface of the extrusion sliding block (404) and surrounds the left outer surface of the connecting rod (403). The triangular sliding block (407) is fixedly connected to the left inner wall of the expansion pipe (2). The cutter outlet (408) is arranged on the left upper surface of the expansion pipe (2). A drill bit thread (5) is arranged on the bottom of the expansion pipe (2).

2. A partially expandable underreamer for use in a geological borehole according to claim 1, wherein: The guide shaft (401), the cross plug slot (402), the connecting rod (403), the extrusion sliding block (404), the conductive drill rod (303), the reverse thread (304), and the cross plug (305) are all arranged in the inside of the sliding sleeve (306).

3. A partially expandable underreamer for use in a geological borehole, according to claim 1, wherein: The two ends of the connecting rod (403) are fixedly connected to the left outer surface center of the guide shaft (401) and the left inner wall center of the expansion pipe (2), respectively.

4. A partially expandable underreamer for use in a geological borehole according to claim 1, wherein: The number of the reaming cutters (405) is two, and the two reaming cutters (405) are symmetrically distributed on the upper and lower outer surfaces of the extrusion sliding block (404) with the center line of the extrusion sliding block (404) as the axis.

5. A partially expandable underreamer for use in a geological borehole according to claim 1, wherein: The number of the triangular sliding blocks (407) is two, and the other triangular sliding block (407) is fixedly connected to the lower left inner wall of the expansion pipe (2). The number of the cutter outlets (408) is two, and the other cutter outlet (408) is arranged on the left lower surface of the expansion pipe (2).

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