Power head grouting device for spiral drilling cast-in-place pile and matched drilling tool of power head grouting device

Abstract

The utility model relates to a power head grouting device for a spiral drilling cast-in-place pile and a matched drilling tool of the power head grouting device, a power head speed reducer main shaft is coaxially matched with an opening end of a power head speed reducer box body through a main shaft bearing, and a fixed part and a rotating part are respectively arranged between the lower end of an injection connector part and the upper end of the power head speed reducer main shaft. The upper part and the lower part of the fixed part are respectively connected with the injection interface part and the power head speed reducer box body, the rotating part is connected with a power head speed reducer main shaft, the fixed part and the rotating part are coaxially sealed and matched through a V-shaped sealing group, the outer circumference of the power head speed reducer main shaft is in interference fit and is in sealing fit with a steel sleeve, and the fixed part is in sealing fit with the outer circumference of the steel sleeve. The power head grouting device can prevent grout from entering the inner cavity of the speed reducer, the maintenance cost is reduced, and the service life of the power head is prolonged.

Description

Technical Field

[0001] The utility model relates to a power head grouting device for spiral bored piles and a matching drilling tool thereof, belonging to the technical field of building construction equipment. Background Art

[0002] In the construction of building pile foundation, spiral bored piles occupy a large market share. It has the advantages of adapting to a wide range of strata and high construction efficiency, but it also has obvious disadvantages: First, the construction power head grouting device often leaks slurry into the reducer cavity, damaging the gears and bearings in the box; second, the drilling efficiency is low for hard rock formations, and pneumatic down-the-hole hammers are usually used to lead holes, and then spiral hole expansion is used for construction, which has high construction costs and low work efficiency; third, there is a lot of loose soil at the bottom of the spiral bored pile, which affects the bearing capacity of the pile. Grouting equipment is usually used to reinforce it by injecting cement slurry. In the construction of spiral bored piles, the power head is a key component, among which the grouting device on the power head is the throat of the spiral bored pile and the only way to transport the materials for drilling and pile formation. It is urgent to solve the problems of frequent leakage of the existing construction power head grouting device, slow drilling of the power head in hard rock formations, and excessive loose soil at the bottom of the piles in non-hard rock formations. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a power head grouting device for spiral bored cast-in-place piles, which can prevent slurry from entering the inner cavity of the reducer, reduce maintenance costs, and increase the service life of the power head; its matching drilling tool can expand the range of rock and soil layers applicable to spiral bored cast-in-place piles, thereby realizing the multi-purpose functions of the grouting device.

[0004] In order to solve the above problems, the specific technical scheme of the utility model is as follows: a power head grouting device for spiral bored piles, the power head reducer main shaft is coaxially matched with the open end of the power head reducer housing through the main shaft bearing, a fixed part and a rotating part are respectively provided between the lower end of the injection interface and the upper end of the power head reducer main shaft, the fixed part is respectively connected to the injection interface and the power head reducer housing, the rotating part is connected to the power head reducer main shaft, a V-shaped sealing group is coaxially sealed between the fixed part and the rotating part, a steel sleeve is interference fit and sealed on the outer circumference of the power head reducer main shaft, and the fixed part is sealed with the outer circumference of the steel sleeve.

[0005] The fixed part includes a spindle end cover of the power head and a frame; a flange end plate is provided at the lower end of the injection interface, the upper half of the frame is a cylinder, and is connected with the flange end plate, and the cylindrical structure of the frame is coaxially matched with the rotating part through a V-shaped sealing group; the spindle end cover of the power head is sealed and connected to the upper surface of the open end of the power head reducer housing, and the lower end surface of the frame is seated on the spindle end cover of the power head, and the screws pass through the frame and the spindle end cover of the power head in turn to be connected with the end surface of the power head reducer housing; the inner circumference of the spindle end cover of the power head is sealed with the steel sleeve through a rotating seal.

[0006] The lower half of the frame is a trapezoidal structure composed of a plurality of obliquely arranged reinforcing ribs, and a window communicating with the inner cavity is formed between every two adjacent reinforcing ribs.

[0007] The upper surface of the main shaft end cover of the power head is connected to the gland by screws. The inner circumference of the gland is provided with a sealing ring, and forms a rotating sealing pair with the outer circumference of the steel sleeve.

[0008] The rotating part is a rotating body, the main body of the rotating body is a hollow cylindrical structure, the lower end of the hollow cylinder is coaxially matched with the inner hole of the main shaft of the power head reducer; the inner hole diameter of the hollow cylinder is equal to the diameter of the injection interface; a disc structure is provided on the outer circumference of the hollow cylinder, and the disc structure is connected to the main shaft of the power head reducer by screws.

[0009] The disc structure is provided with a downward folded edge, and shields the sealing structure formed by the steel sleeve and the fixing part.

[0010] The outer surfaces of the rotating body and the steel sleeve are hardened.

[0011] The injection interface part is composed of a column, a thin tube body and a thick tube body, and the inner cavities of the three bodies form a connected hole cavity; wherein the inner cavity diameter of the column is not less than the inner cavity diameter of the thick tube body; the thick tube body is an arc-shaped pipe fitting body, one end of which is fixed to the middle part of the column at an upward inclination angle, and the other end is provided with a joint A connected to the concrete hose; one end of the thin tube body is fixed to the upper end of the column through a blocking plate, and the other end of the thin tube body is provided with a joint B connected to a cement slurry delivery pipe or a pressure gas delivery pipe.

[0012] The injection interface part is composed of a connector, a thin tube body, a thick tube body and a pipe clamp, and the connector, the thin tube body and the inner cavity of the thick tube body are connected; the connector is located at the bottom of the overall structure, and the lower end is connected to the frame body, the upper end of the connector is connected to the thick tube body through the pipe clamp, and the diameter of the cavity in the connector is not less than the diameter of the cavity in the thick tube body; the thick tube body is an arc-shaped tubular structure, and the end is fixedly connected to the joint A connected to the concrete hose; the thin tube body is an arc-shaped structure, one end of which is fixedly connected to the thick tube body above the pipe clamp, and the other end is provided with a joint B connected to the cement slurry delivery pipe or the pressure gas delivery pipe.

[0013] A matching drill tool using a power head grouting device for spiral bored piles, wherein a power head output flange is provided at the output end of a power head reducer housing, and a flange at the top of a drill rod is connected to the power head output flange; the drill rod consists of a drill tool inner tube, a drill tool outer tube and a spiral blade, the drill tool inner tube and the drill tool outer tube are coaxially arranged, and an air vent is provided near the top of the drill rod, the air vent passes through one side of the drill tool inner tube and the drill tool outer tube, and is communicated with the atmosphere; the lower end of the drill rod is coaxially connected to a drill bit, and an air outlet is provided at the bottom end of the drill tool inner tube inside the drill bit, and is communicated with the atmosphere.

[0014] The utility model adopts the above structure and has the following advantages:

[0015] Three sealing pairs are arranged in the power head reducer housing, and the gears and bearings in the power head reducer housing are provided with a safe operating environment, with a low construction failure rate, thus improving construction efficiency and extending the service life of the power head reducer.

[0016] The upper end of the main shaft of the power head reducer rotates coaxially with the main shaft by means of a rotating body and a steel sleeve, and contacts with the corresponding sealing element. The main shaft is free of wear, thus maintaining the integrity of the main shaft and reducing the use cost of the wear parts of the power head grouting device.

[0017] The power head grouting device has a leakage alarm function. When the V-type sealing group is excessively worn and leaks, the leaked slurry flows out of the window of the frame and scatters on the surface, triggering a leakage alarm.

[0018] The outer diameter surface of the upper part of the rotating body and the outer diameter surface of the steel sleeve are hardened and have a long service life.

[0019] The power head grouting device is arranged above the power head main shaft. Compared with the grouting device arranged between the drilling tool and the power head, it has a simple structure, is easy to install and maintain, and has a low manufacturing cost.

[0020] The power head grouting device integrates the concrete pouring channel, cement slurry pouring channel and pressure air pouring channel into one, which simplifies the facilities and has good versatility.

[0021] The power head grouting device is used in the drilling tool to expand the applicable rock and soil range of spiral drilling and grouting piles. For hard rock layers, air can be added to improve the efficiency of drilling construction. For non-hard rock layers, cement slurry can be added to the bottom of the pile hole to reinforce the loose soil and improve the bearing capacity of the pile, realizing the multi-purpose function of the grouting device.

[0022] It can provide technical support for the upgrading and transformation of existing equipment with low cost and good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the power head grouting device.

[0024] Figure 2A schematic diagram of the structure of the frame.

[0025] Figure 3 It is a schematic diagram of the structure of the rotating body.

[0026] Figure 4 It is another structural form of the injection interface.

[0027] Figure 5 It is a drilling tool with a power head grouting device for spiral bored piles. DETAILED DESCRIPTION

[0028] like Figure 1 As shown, a power head grouting device for spiral bored piles, the power head reducer main shaft 11 is coaxially matched with the open end of the power head reducer housing 10 through the main shaft bearing 12, a fixed part and a rotating part are respectively provided between the lower end of the injection interface part 5 and the upper end of the power head reducer main shaft 11, the fixed part is respectively connected to the injection interface part 5 and the power head reducer housing 10, the rotating part is connected to the power head reducer main shaft 11, the fixed part and the rotating part are coaxially sealed through a V-shaped sealing group 6, the outer circumference of the power head reducer main shaft 11 is interference fit and sealed with a steel sleeve 7, and the fixed part is sealed with the outer circumference of the steel sleeve 7. Due to the interference fit between the steel sleeve 7 and the power head reducer main shaft 11, the rotating body 3 and the steel sleeve 7 rotate along with the power head reducer main shaft 11. The outer surfaces of the rotating body 3 and the steel sleeve 7 are in a hardened state. Therefore, during the rotation process, the outer surfaces of the rotating body 3 and the steel sleeve 7 respectively form a sealing pair with the fixed part through the seal, thereby avoiding the wear of the power head reducer main shaft 11 and increasing the service life of the overall power head.

[0029] The fixed part includes a power head spindle end cover 1 and a frame 4; a flange end plate is provided at the lower end of the injection interface part 5, the upper half of the frame 4 is a cylinder, and is connected with the flange end plate, and the cylindrical structure of the frame 4 is coaxially matched with the rotating part through a V-shaped sealing group 6, and the V-shaped sealing group 6 serves as the first rotary seal pair of the equipment; the power head spindle end cover 1 is sealed and connected to the upper surface of the open end of the power head reducer housing 10, and the lower end face of the frame 4 is seated on the power head spindle end cover 1, and the screws pass through the frame 4 and the power head spindle end cover 1 in turn and are connected to the end face of the power head reducer housing 10; the inner circumference of the power head spindle end cover 1 is sealed with the steel sleeve 7 through a rotary seal 8, and the rotary seal 8 serves as the second rotary seal pair of the equipment.

[0030] like Figure 2As shown, the lower half of the frame 4 is a trapezoidal structure composed of a plurality of inclined reinforcing ribs 4-1, and a window 4-2 communicating with the inner cavity is formed between every two adjacent reinforcing ribs 4-1. The frame 4 serves as a transition connection between the upper and lower parts. At the same time, when the V-shaped seal group 6 of the first rotary seal pair fails, the slurry is exposed and overflows from the window 4-2, which serves as a seal failure alarm and the V-shaped seal group 6 is replaced in time, thereby ensuring the sealing performance of the second rotary seal pair.

[0031] The upper surface of the power head spindle end cover 1 is connected to the gland 2 by screws. The inner circumference of the gland 2 is provided with a sealing ring, and forms a third rotating sealing pair with the outer circumference of the steel sleeve 7, thereby further ensuring the sealing performance of the equipment.

[0032] like Figure 3 As shown, the rotating part is a rotating body 3, and the main body of the rotating body 3 is a hollow cylinder 3-1 structure. The lower end of the hollow cylinder 3-1 is coaxially matched with the inner hole of the power head reducer main shaft 11; the inner hole diameter of the hollow cylinder 3-1 is equal to the diameter of the injection interface part 5; a disc structure 3-2 is provided on the outer circumference of the hollow cylinder 3-1, and the disc structure 3-2 is connected to the power head reducer main shaft 11 through screws. The disc structure 3-2 is provided with a downward folded edge, and the sealing structure formed by the steel sleeve 7 and the fixed part is shielded. When the first rotary seal pair fails to seal, the second and third rotary seal pairs can be further protected.

[0033] like Figure 1 As shown, the injection interface part 5 is composed of a column 5-1A, a thin tube body 5-2, and a thick tube body 5-3, and the inner cavities of the three bodies form a connected hole cavity; wherein, the inner cavity diameter of the column 5-1A is not less than the inner cavity diameter of the thick tube body 5-3; the thick tube body 5-3 is an arc-shaped pipe body, one end of which is fixed to the middle part of the column 5-1A at an upward inclination angle, and the other end is provided with a joint A5-5 connected to the concrete hose; one end of the thin tube body 5-2 is fixed to the upper end of the column 5-1A through a blocking plate, and the other end of the thin tube body 5-2 is provided with a joint B5-6 connected to a cement slurry delivery pipe or a pressure gas delivery pipe.

[0034] like Figure 4As shown, the injection interface part 5 is composed of a connector 5-1B, a thin tube body 5-2, a thick tube body 5-3 and a pipe clamp 5-4. The connector 5-1B, the thin tube body 5-2 and the inner bore of the thick tube body 5-3 are connected; the connector 5-1B is located at the bottom of the overall structure, and the lower end is connected to the frame 4, the upper end of the connector 5-1B is connected to the thick tube body 5-3 through the pipe clamp 5-4, and the inner bore diameter of the connector 5-1B is not less than the inner bore diameter of the thick tube body 5-3; the thick tube body 5-3 is an arc-shaped tubular structure, and the end is fixedly connected to the joint A5-5 connected to the concrete hose; the thin tube body 5-2 is an arc-shaped structure, one end of which is fixedly connected to the thick tube body 5-3 above the pipe clamp 5-4, and the other end is provided with a joint B5-6 connected to the cement slurry delivery pipe or the pressure gas delivery pipe.

[0035] like Figure 5 As shown, a supporting drill tool using a power head grouting device for spiral bored piles is provided, wherein a power head output flange 14 is provided at the output end of a power head reducer housing 10, and a flange at the top of a drill rod 15 is connected to the power head output flange 14; the drill rod 15 is composed of a drill tool inner tube 16, a drill tool outer tube 17 and a spiral blade 18, the drill tool inner tube 16 and the drill tool outer tube 17 are coaxially arranged, and an air vent 19 is provided near the top of the drill rod 15, the air vent 19 passes through one side of the drill tool inner tube 16 and the drill tool outer tube 17, and is communicated with the atmosphere; the lower end of the drill rod 15 is coaxially connected to a drill bit 20, and an air outlet 21 is provided at the bottom end of the drill tool inner tube 16 inside the drill bit 20, and is communicated with the atmosphere. The supporting drill tool of the power head grouting device for spiral bored cast-in-place piles can realize air supply at the bottom of the hole through an air compressor and a pipeline when constructing the pile hole, assist in slag removal and cool the drill bit, and achieve high drilling efficiency; the power head grouting device can realize that before concrete pouring, the soil at the bottom of the pile hole is reinforced by cement slurry pressure injection through a cement slurry pump and a pipeline, so that there is no loose soil at the bottom of the pile.

[0036] The working principle of the power head grouting device is as follows: the motor or electric motor drives the power head reducer input shaft to rotate, and reduces speed through the gear pair to drive the power head reducer main shaft 11 to rotate. The power head reducer main shaft 11 drives the rotating body 3 and the steel sleeve 7 to rotate coaxially. The power head main shaft end cover 1, the pressure cover 2, the frame 4 and the injection interface 5 directly or indirectly fixed on the power head reducer housing are kept stationary. The frame 4 and the rotating body 3 are sealed by a V-shaped sealing group 6 to form a rotating seal pair to ensure that the slurry injected from the thin tube body 5-2 and the thick tube body 5-3 all enter the inner hole cavity of the main shaft. The pressure cover 2 and the steel sleeve 7 are sealed by a sealing member to form a rotating seal pair. The power head main shaft end cover 1 and the steel sleeve 7 are sealed by a rotating seal 8 to form a rotating seal pair. Even if the V-type seal group 6 is used beyond the prescribed period, the leaked slurry will flow downward along the cylindrical outer surface of the upper end of the rotating body 3 until it reaches the bottom of the cavity in the frame 4, and then flow out from the window of the frame 4 to the upper surface of the power head reducer housing, and fall to the ground surface. The construction staff can easily find the leakage and replace the V-type seal group 6 in time. The two rotating seal pairs formed between the gland 2 and the power head spindle end cover 1 and the steel sleeve 7 are further protection for the power head reducer. The cylindrical outer surface of the upper part of the rotating body 3 and the outer surface of the steel sleeve 7 are hardened to improve the wear resistance of the outer surface and the service life of the seal.

Claims

1. A power head grouting device for spiral bored piles, wherein the power head reducer main shaft (11) is coaxially matched with the open end of the power head reducer housing (10) through the main shaft bearing (12), characterized in that: A fixed portion and a rotating portion are provided between the lower end of the injection interface portion (5) and the upper end of the power head reducer main shaft (11), respectively. The fixed portion is connected to the injection interface portion (5) and the power head reducer housing (10) at the upper and lower ends, respectively. The rotating portion is connected to the power head reducer main shaft (11). A V-shaped sealing group (6) is coaxially sealed between the fixed portion and the rotating portion. A steel sleeve (7) is provided on the outer circumference of the power head reducer main shaft (11) with interference fit and sealing fit. The fixed portion is sealed fit with the outer circumference of the steel sleeve (7).

2. The power head grouting device for spiral bored pile according to claim 1, characterized in that: The fixing part comprises a spindle end cover (1) of the power head and a frame (4); a flange end plate is provided at the lower end of the injection interface part (5); the upper half of the frame (4) is a cylinder and is connected to the flange end plate; the cylindrical structure of the frame (4) is coaxially matched with the rotating part through a V-shaped sealing group (6); the upper surface of the open end of the power head reducer housing (10) is sealed and connected to the spindle end cover (1) of the power head, the lower end surface of the frame (4) is seated on the spindle end cover (1) of the power head, and screws are sequentially passed through the frame (4) and the spindle end cover (1) of the power head to be connected to the end surface of the reducer housing (10) of the power head; the inner circumference of the spindle end cover (1) of the power head is sealed and matched with the steel sleeve (7) through a rotating seal (8).

3. The power head grouting device for spiral bored pile according to claim 2, characterized in that: The lower half of the frame (4) is a trapezoidal structure composed of a plurality of obliquely arranged reinforcing ribs (4-1), and a window (4-2) communicating with the inner cavity is formed between every two adjacent reinforcing ribs (4-1).

4. The power head grouting device for spiral bored pile according to claim 2, characterized in that: The upper surface of the power head spindle end cover (1) is connected to the gland (2) via screws. The inner circumference of the gland (2) is provided with a sealing ring, which forms a rotating sealing pair with the outer circumference of the steel sleeve (7).

5. The power head grouting device for spiral bored pile according to claim 1, characterized in that: The rotating part is a rotating body (3), the main body of the rotating body (3) is a hollow cylinder (3-1) structure, the lower end of the hollow cylinder (3-1) is coaxially matched with the inner hole of the power head reducer main shaft (11); the inner hole diameter of the hollow cylinder (3-1) is equal to the diameter of the injection interface part (5); a disc structure (3-2) is provided on the outer circumference of the hollow cylinder (3-1), and the disc structure (3-2) is connected to the power head reducer main shaft (11) by screws.

6. The power head grouting device for spiral bored pile according to claim 5, characterized in that: The disc-type structure (3-2) is provided with a downward folded edge, and covers the sealing structure formed by the steel sleeve (7) and the fixing part.

7. The power head grouting device for spiral bored pile according to claim 5, characterized in that: The outer surfaces of the rotating body (3) and the steel sleeve (7) are hardened.

8. The power head grouting device for spiral bored pile according to claim 1, characterized in that: The injection interface part (5) is composed of a column (5-1A), a thin tube body (5-2), and a thick tube body (5-3), and the inner cavities of the three bodies form a connected hole cavity; wherein the inner cavity diameter of the column (5-1A) is not less than the inner cavity diameter of the thick tube body (5-3); the thick tube body (5-3) is an arc-shaped pipe body, one end of which is fixed to the middle part of the column (5-1A) at an upward inclination angle to form a whole, and the other end is provided with a joint A (5-5) connected to a concrete hose; one end of the thin tube body (5-2) is fixed to the upper end of the column (5-1A) through a blocking plate to form a whole, and the other end of the thin tube body (5-2) is provided with a joint B (5-6) connected to a cement slurry delivery pipe or a pressure gas delivery pipe.

9. The power head grouting device for spiral bored pile according to claim 1, characterized in that: The injection interface part (5) is composed of a connector (5-1B), a thin tube body (5-2), a thick tube body (5-3) and a pipe clamp (5-4); the connector (5-1B), the thin tube body (5-2) and the inner bore of the thick tube body (5-3) are connected; the connector (5-1B) is located at the bottom of the overall structure, and the lower end is connected to the frame (4); the upper end of the connector (5-1B) is connected to the thick tube body (5-3) through the pipe clamp (5-4); the inner bore diameter of the connector (5-1B) is not less than the inner bore diameter of the thick tube body (5-3); the thick tube body (5-3) is an arc-shaped tubular structure, and the end thereof is fixedly connected to a joint A (5-5) connected to a concrete hose; the thin tube body (5-2) is an arc-shaped structure, one end of which is fixedly connected to the thick tube body (5-3) above the pipe clamp (5-4), and the other end is provided with a joint B (5-6) connected to a cement slurry delivery pipe or a pressure gas delivery pipe.

10. A matching drilling tool using the power head grouting device for spiral bored piles according to claim 1, characterized in that: A power head output flange (14) is provided at the output end of the power head reducer housing (10), and a flange at the top of a drill rod (15) is connected to the power head output flange (14); the drill rod (15) is composed of a drill tool inner tube (16), a drill tool outer tube (17) and a spiral blade (18); the drill tool inner tube (16) and the drill tool outer tube (17) are coaxially arranged; a vent hole (19) is provided near the top of the drill rod (15); the vent hole (19) penetrates one side of the drill tool inner tube (16) and the drill tool outer tube (17) and communicates with the atmosphere; the lower end of the drill rod (15) is coaxially connected to a drill bit (20); a vent hole (21) is provided at the bottom end of the drill tool inner tube (16) inside the drill bit (20) and communicates with the atmosphere.

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