A variable-angle self-rotating rotary drilling bit and its foundation construction method applied to root piles

Abstract

The present invention discloses a variable-angle self-rotating rotary drilling bit in the technical field of root pile bits and a foundation construction method for root piles using the same. The bit structure includes a housing and a rotating shaft. A number of bit mounting shafts arranged in a ring outside the rotating shaft are penetrated through the housing. Removable bits are installed at the bottom of the rotating shaft and the bit mounting shafts. A driving gear is sleeved on the outer wall of the housing where the rotating shaft is located. Driven gears are sleeved on the outer walls of the bit mounting shafts through a floating structure. An adjusting structure is provided at the top of the bit mounting shaft. The present invention proposes a novel rotary drilling bit for a rotary drilling rig. Through the principle of single-shaft transmission, a self-rotating root pile drilling device is formed. And through the adjustment system on the bit, the function of multiple inclination degrees is realized, which reduces the width of the access road construction for the construction site with a "point-like linear" distribution of transmission lines and provides convenience for protecting the ecological environment.

Description

Technical Field

[0001] The present invention relates to the technical field of root pile drills, and specifically to a variable-angle self-rotating rotary drilling bit and a foundation construction method for root piles using the same. Background Art

[0002] With the continuous increase in labor costs and the continuous improvement of construction safety risks, the mechanized construction of transmission lines has become an inevitable trend. However, transmission lines are linearly distributed in a "point-like" manner, and each construction site is scattered, often in high mountains and steep ridges, with difficulties in equipment access. Therefore, the mechanized foundation construction of transmission lines has always been a shortcoming in line construction.

[0003] How to access the equipment and how to miniaturize the construction equipment have become important factors in solving the problems of mechanized construction of transmission lines. Starting from the source of design, the present invention proposes a new type of foundation form, "multi-inclination large-diameter pier root piles", to fundamentally solve the problems of large equipment power and heavy weight.

[0004] Conventional rotary drilling bits for rotary drilling rigs include: bucket-tooth sand buckets, pick-tooth sand buckets, pick-tooth barrel drills, roller cone barrel drills, and underreaming bits. Bucket-tooth bits are suitable for formations with relatively loose structures, and pick-tooth bits are suitable for formations such as hard soil layers and sandy gravel layers.

[0005] Although the above-mentioned rotary drilling bits for rotary drilling rigs can meet the construction requirements of most foundation projects, when encountering a project with a large-diameter pier structure in the upper part and "multi-inclination large-diameter pier root piles" in the lower part, the current rotary drilling bits for rotary drilling rigs cannot meet the project requirements.

[0006] Based on this, the present invention designs a variable-angle self-rotating rotary drilling bit and a foundation construction method for root piles using the same to solve the above problems. Summary of the Invention

[0007] The purpose of the invention is to provide a variable-angle self-rotating rotary drilling bit and a foundation construction method for root piles using the same to solve the above technical problems.

[0008] To achieve the above-mentioned purpose, the invention provides the following technical solutions: a variable-angle self-rotating rotary drilling drill bit, comprising a shell and a rotating shaft respectively installed on a pile driver frame and a main shaft, the rotating shaft rotatably passing through the shell, the shell is a shell structure with an installation cavity, a plurality of drill bit mounting shafts arranged in a ring on the outside of the rotating shaft are passed through the shell, a detachable drill bit is installed at the bottom of the rotating shaft and the drill bit mounting shaft, the rotating shaft is located on the outer wall of the shell and is sleeved with a driving gear, the outer wall of the drill bit mounting shaft is sleeved with a driven gear through a floating structure, each of the driven gears is meshed with the driving gear for transmission, and an adjustment structure for adjusting the inclination angle of the drill bit mounting shaft is provided at the top of the drill bit mounting shaft.

[0009] Preferably, the floating structure includes a connecting sleeve fixed to the inner side of the driven gear, the upper end of the connecting sleeve is rotatably mounted with the outer shell through a bearing, the inner cavity of the connecting sleeve is fixedly provided with a wear-resistant rubber pad, the inner cavity of the wear-resistant rubber pad is fixedly connected to a rigid contact ring through an elastic part, and the drill bit mounting shaft is fixedly embedded in the rigid contact ring.

[0010] Preferably, the adjustment structure comprises a connecting plate fixedly connected to the top end of the drill bit mounting shaft, and a plurality of screw pitch adjustment assemblies are arranged in a ring on the outer side of the bottom of the connecting plate.

[0011] Preferably, the screw pitch-adjusting assembly comprises a pitch-adjusting screw and a pitch-adjusting nut sleeve which are rotatably mounted on the connecting plate and the housing respectively, and the pitch-adjusting screw and the pitch-adjusting nut sleeve are coaxially threadedly arranged.

[0012] Preferably, the number of the screw pitch adjustment components is four groups, which are distributed in a square top angle.

[0013] Preferably, two mutually perpendicular cylindrical level bubbles are arranged on the top of the connecting plate.

[0014] Preferably, a cooling water pipe is embedded in the drill bit mounting shaft, and a water outlet at the lower end of the cooling water pipe acts on the detachable drill bit.

[0015] A method for foundation construction of a tree root pile using a variable angle self-rotating rotary drilling bit comprises the following steps:

[0016] 1. The site is leveled, the rotary drilling rig is in place, the upper large-diameter pier foundation drill bit is selected, and rotary drilling is carried out to the designed bottom of the pier foundation.

[0017] 2. According to the site requirements, adjust the drilling angle of the "detachable self-rotating drill bit" by adjusting the screw pitch adjustment assembly.

[0018] 3. Install the "variable angle self-rotating" rotary drilling rig drill bit, turn on the equipment to check the drill bit's self-rotation performance, and after checking that everything is correct, connect the cooling water pipe and the external coolant tank to ensure that the cooling pipe is unobstructed.

[0019] 4. Manually locate the drilling positions of the micro-piles to ensure accurate drilling positions.

[0020] 5. Start the drilling rig, start the coolant pressure device, drill, clear the hole in time. After the drilling is completed, check the drilling indexes such as hole depth and hole inclination in time. If the requirements cannot be met, re-drill.

[0021] 6. Fabricate the steel cage of the root pile on-site, hoist the steel cage through the rotary drilling rig, lower the steel cage of the root pile, and pour the concrete of the root pile and vibrate it in time.

[0022] 7. After the concrete of the root pile foundation begins to set, fabricate the steel cage of the large-diameter pier and abutment foundation, hoist the steel cage through the rotary drilling rig, pour the concrete of the large-diameter pier and abutment and vibrate it in time, and carry out the foundation maintenance.

[0023] Compared with the prior art, the beneficial effects of the invention are as follows:

[0024] The present invention proposes a new type of transmission line foundation type, with a large upper size and a small lower size, providing a design basis for the miniaturization of equipment in mountainous areas, and reducing the construction width of the access road for the construction sites with a "point-like linear" distribution of transmission lines, which is convenient for protecting the ecological environment.

[0025] The present invention proposes a new type of rotary drilling rig bit. Through the principle of single-axis drive, a self-rotating root pile drilling device is formed, and through the adjustment system on the bit, the function of multiple inclinations is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic diagram of the overall structure of the variable-angle self-rotating rotary drilling bit of the present invention;

[0028] Figure 2 It is a schematic diagram of the top view structure of the variable-angle self-rotating rotary drilling bit of the present invention;

[0029] Figure 3 It is a schematic diagram of the cross-sectional structure of the variable-angle self-rotating rotary drilling bit of the present invention;

[0030] Figure 4 It is a schematic diagram of the adjustment structure of the variable-angle self-rotating rotary drilling bit of the present invention;

[0031] Figure 5 It is a schematic diagram of the root pile structure of the present invention.

[0032] In the accompanying drawings, the list of components represented by each reference numeral is as follows:

[0033] 1 - housing, 2 - rotating shaft, 3 - drill bit mounting shaft, 4 - detachable drill bit, 5 - driving gear, 6 - driven gear, 61 - connecting sleeve, 62 - wear-resistant rubber pad, 63 - elastic member, 64 - rigid contact ring, 7 - adjusting structure, 71 - connecting plate, 72 - screw pitch adjusting assembly, 721 - pitch adjusting screw, 722 - pitch adjusting nut, 73 - cylindrical spirit level, 8 - cooling water pipe, 9 - driven gear. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the invention. Obviously, the described embodiments are only a part of the embodiments of the invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the invention without making creative efforts shall fall within the scope of protection of the invention.

[0035] Please refer to Figures 1-5 , the invention provides a technical solution: a variable-angle self-rotating rotary drilling bit, including a housing 1 and a rotating shaft 2 respectively installed on the pile driver frame and the main shaft. The housing 1 is composed of steel plates, and the main purpose is to protect the transmission device from external damage. Relevant detachable parts need to be provided to facilitate the maintenance of the internal structure. The rotating shaft 2 rotatably penetrates through the housing 1. The housing 1 is a housing structure with an installation cavity. A plurality of drill bit mounting shafts 3 arranged in a ring outside the rotating shaft 2 are penetrated through the housing 1. A detachable drill bit 4 is installed at the bottom of the rotating shaft 2 and the drill bit mounting shaft 3. A driving gear 5 is sleeved on the outer wall of the housing 1 where the rotating shaft 2 is located. A driven gear 9 is sleeved on the outer wall of the drill bit mounting shaft 3 through a floating structure 6. Each driven gear 9 is meshed and driven with the driving gear 5. An adjusting structure 7 for adjusting the inclination angle of the drill bit mounting shaft 3 is provided at the top of the drill bit mounting shaft 3;

[0036] Among them, the floating structure 6 includes a connecting sleeve 61 fixed to the inner side of the driven gear 9. The upper end of the connecting sleeve 61 is rotatably installed on the housing 1 through a bearing. As a support structure for the drill bit mounting shaft 3, a wear-resistant rubber pad 62 is fixedly arranged in the inner cavity of the connecting sleeve 61. As an intermediate member, it plays a role of connecting and buffering. A rigid contact ring 64 is fixedly connected to the inner cavity of the wear-resistant rubber pad 62 through an elastic member 63. The elastic member 63 can be a spring or other structural members that can be bent and deformed and restored to its original state. The drill bit mounting shaft 3 is fixedly embedded in the rigid contact ring 64. Due to the deformable characteristics of the elastic member 63, when the adjusting structure 7 adjusts and drives the drill bit mounting shaft 3 to tilt to one side, the drill bit mounting shaft 3 can maintain relative fixation with the driven gear 9, so that it does not affect the rotation of the drill bit mounting shaft 3 driven by the driving gear 5 through the meshing relationship with the driven gear 9 during work;

[0037] The adjustment structure 7 includes a connecting plate 71 fixedly connected to the top of the drill bit mounting shaft 3, and a plurality of screw pitch adjustment assemblies 72 are arranged in a ring on the outer side of the bottom of the connecting plate 71. The screw pitch adjustment assembly 72 includes a pitch adjustment screw 721 and a pitch adjustment screw sleeve 722 which are respectively rotatably mounted on the connecting plate 71 and the housing 1. The pitch adjustment screw 721 and the pitch adjustment screw sleeve 722 are coaxially screwed. There are four groups of screw pitch adjustment assemblies 72, which are distributed in a square top angle. The pitch adjustment screw 721 in the screw pitch adjustment assembly 72 can be changed by rotating the pitch adjustment screw 721 in the screw pitch adjustment assembly 72. The length of the four sets of screw pitch adjustment components 72 can be adjusted to change the inclination angle of the connecting plate 71 relative to the housing 1. Since the connecting plate 71 is relatively fixed to the drill bit mounting shaft 3, adjusting the inclination of the connecting plate 71 means adjusting the inclination angle of the drill bit mounting shaft 3 and the detachable drill bit 4, thereby forming a stump-like radial structure; in addition, two mutually perpendicular cylindrical level bubbles 73 are arranged on the top of the connecting plate 71, which are used as reference calibration for adjusting the horizontal state of the connecting plate 71 and the inclination angle of the detachable drill bit 4;

[0038] Among them, a cooling water pipe 8 is embedded in the drill bit installation shaft 3, and the lower end outlet of the cooling water pipe 8 acts on the detachable drill bit 4. By passing the coolant, the drill bit is prevented from being damaged by overheating when drilling into the rock.

[0039] The foundation of the "multi-inclination large-diameter pier root pile" consists of two parts, an upper large-diameter circular pier (a) and a lower multi-directional micro pile foundation (b). The specific steel structure is existing technology and will not be repeated here.

[0040] A variable angle self-rotating rotary drilling bit is applied to a foundation construction method of a tree root pile, characterized in that it comprises the following steps:

[0041] 1. The site is leveled, the rotary drilling rig is in place, the upper large-diameter pier foundation drill bit is selected, and rotary drilling is carried out to the designed bottom of the pier foundation.

[0042] 2. According to the site requirements, adjust the drilling angle of the "detachable self-rotating drill bit" by adjusting the screw pitch adjustment assembly.

[0043] 3. Install the "variable angle self-rotating" rotary drilling rig drill bit, turn on the equipment to check the drill bit's self-rotation performance, and after checking that everything is correct, connect the cooling water pipe and the external coolant tank to ensure that the cooling pipe is unobstructed.

[0044] 4. Manually locate the micropile drilling position to ensure the accuracy of the drilling position.

[0045] 5. Turn on the drilling rig, turn on the coolant pressure device, drill, clean the hole in time, and check the drilling indicators such as hole depth and hole inclination in time after drilling. If they cannot meet the requirements, drill again.

[0046] 6. Tie the steel cage of the root pile on-site. Lift the steel cage of the root pile with a rotary drilling rig, lower the steel cage of the root pile, pour the concrete of the root pile and vibrate it in time.

[0047] 7. After the concrete of the root pile foundation begins to set, tie the steel cage of the large-diameter pier foundation. Lift the steel cage with a rotary drilling rig, pour the concrete of the large-diameter pier and vibrate it in time, and carry out foundation maintenance.

[0048] In the description of the invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the invention.

[0049] In the invention, unless otherwise clearly specified and defined, the terms "install", "set", "connect", "fix", "swivel connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0050] Although the embodiments of the invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the invention. The scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A variable angle self-rotating rotary drilling drill bit, Features: The invention comprises a housing (1) mounted on a frame of a rotary drilling rig, and a rotating shaft (2) mounted on a main shaft; the rotating shaft (2) rotatably penetrates the housing (1); the housing (1) is a shell structure having a mounting cavity; a plurality of drill bit mounting shafts (3) arranged in a ring on the outside of the rotating shaft (2) are penetrated through the housing (1); a detachable drill bit (4) is mounted on the bottom of the rotating shaft (2) and the drill bit mounting shaft (3); the rotating shaft (2) is located in the housing (1) and a driving gear (5) is sleeved on the outer wall; a driven gear (9) is sleeved on the outer wall of the drill bit mounting shaft (3) through a floating structure (6); each driven gear (9) is meshed with the driving gear (5) for transmission; and an adjusting structure (7) for adjusting the inclination angle of the drill bit mounting shaft (3) is arranged at the top end of the drill bit mounting shaft (3); The floating structure (6) comprises a connecting sleeve (61) fixed to the inner side of the driven gear (9), the upper end of the connecting sleeve (61) is rotatably mounted on the outer shell (1) via a bearing, a wear-resistant rubber pad (62) is fixedly arranged in the inner cavity of the connecting sleeve (61), a rigid contact ring (64) is fixedly connected to the inner cavity of the wear-resistant rubber pad (62) via an elastic member (63), and the drill bit mounting shaft (3) is fixedly embedded in the rigid contact ring (64); The adjustment structure (7) comprises a connecting plate (71) fixedly connected to the top end of the drill bit mounting shaft (3), and a plurality of screw pitch adjustment assemblies (72) are arranged in a ring on the outer side of the bottom of the connecting plate (71); The screw pitch adjustment assembly (72) comprises a pitch adjustment screw (721) rotatably mounted on the connecting plate (71), and also comprises a pitch adjustment screw sleeve (722) rotatably mounted on the housing (1); the pitch adjustment screw (721) and the pitch adjustment screw sleeve (722) are coaxially threadedly arranged; A cooling water pipe (8) is embedded in the drill bit installation shaft (3), and a water outlet at the lower end of the cooling water pipe (8) acts on the detachable drill bit (4).

2. A variable angle self-rotating rotary drilling drill according to claim 1, Features: The screw pitch adjustment components (72) are four in number and are distributed in a square shape.

3. A variable angle self-rotating rotary drilling drill according to claim 2, Features: Two mutually perpendicular cylindrical level bubbles (73) are arranged on the top of the connecting plate (71).

4. A method for applying a variable angle self-rotating rotary drilling bit according to claim 3 to a foundation construction method for tree root piles, It is characterized in that The following steps are involved: (1) The site is leveled, the rotary drilling rig is in place, the upper large-diameter pier foundation drill bit is selected, and the rotary drilling is carried out to the designed bottom of the pier foundation; (2) According to the site requirements, adjust the drilling angle of the detachable drill bit by adjusting the screw pitch adjustment assembly; (3) Install the variable angle self-rotating rotary drilling bit, turn on the equipment to check the self-rotating performance of the variable angle self-rotating rotary drilling bit, and connect the cooling water pipe and the external coolant tank after checking to ensure that the cooling water pipe is unobstructed; (4) Manually locate the micropile drilling position to ensure the accuracy of the drilling position; (5) Start the rotary drilling rig, start the coolant pressure device, drill, clean the hole in time, and check the drilling depth and hole inclination drilling indexes in time after the drilling is completed. If the requirements cannot be met, re-drill; (6) Tie the steel cage of the root pile on-site, hoist the steel cage of the root pile through the rotary drilling rig, lower the steel cage of the root pile, and pour the concrete of the root pile and vibrate it in time; (7) After the concrete of the root pile starts to set, tie the steel cage of the large-diameter pier and abutment foundation, hoist the steel cage of the large-diameter pier and abutment foundation through the rotary drilling rig, pour the concrete of the large-diameter pier and vibrate it in time, and carry out foundation maintenance.

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