Pulse hydraulic impactor and method of drilling and grouting integrated pulse grouting thereof

Abstract

The application provides a pulse hydro-impactor and a method for drilling and grouting in one step by pulse grouting. The pulse hydro-impactor comprises an outer tube, an impact hammer, a hexagonal anvil, a hexagonal sleeve and an upper joint. The outer tube is sleeved with the upper joint and the hexagonal sleeve at two ends respectively. The hexagonal anvil penetrates through the hexagonal sleeve, and the hexagonal anvil is internally provided with a damping channel and a main channel. The impact hammer is internally provided with a main hole, and the impact hammer is sleeved with the outer tube and communicated with the inner hole of the upper joint. The impact hammer can be axially reciprocatingly displaced relative to the outer tube and the upper joint, so that the other end of the impact hammer is clamped on the hexagonal anvil to block the main channel, and the main hole is communicated with the damping channel. Alternatively, the other end of the impact hammer is spaced from the hexagonal anvil, and the main hole is simultaneously communicated with the main channel and the damping channel. The application can realize rapid impact rotary drilling of hard rocks such as big boulders, block stones and pebbles.

Description

Technical Field

[0001] This invention relates to the field of foundation seepage prevention and reinforcement technology in building engineering, and in particular to a pulse hydraulic impactor and its integrated drilling and grouting method, which is applied to rapid impact rotary drilling and grouting operations in complex strata such as Quaternary overburden using the "integrated drilling and grouting, pulse grouting" technology. Background Technology

[0002] "Drilling and grouting integration, pulse grouting" is a novel in-situ extrusion grouting technology that has been widely applied in water conservancy, hydropower, and municipal engineering projects for grouting, seepage prevention, and reinforcement of soft foundations. Existing "drilling and grouting integration, pulse grouting" processes, such as the top-down, high-pressure extrusion grouting method disclosed in patent publication number CN102839651B, integrate drilling, grouting, and wall protection into one unit. During drilling, grouting fluid is used as the flushing fluid. A spiral sealing joint and a one-way joint are installed on the upper part of the drill bit to form a spiral-sealed high-pressure extrusion grouting head. This, combined with a single-cylinder, single-acting reciprocating plunger grouting pump, generates grouting extrusion pressure through the pulse congestion effect, achieving integrated drilling and grouting. High-pressure extrusion grouting is performed on the strata from top to bottom, and the grouting fluid simultaneously handles slag removal and borehole wall protection, combining drilling and grouting with borehole protection.

[0003] However, its spiral-sealed high-pressure extrusion grouting head structure results in a very slow drilling and grouting speed when encountering hard rocks such as large boulders, boulders, and pebbles during the drilling and grouting process. Summary of the Invention

[0004] The purpose of this invention is to provide a pulse hydraulic impactor and a method for integrated drilling and grouting pulse grouting. During integrated drilling and grouting pulse grouting construction, the impact hammer can be cyclically pressed up and down according to the specific pulse frequency of the pulse grout, thereby continuously and effectively impacting the drill bit at the bottom of the drilling and grouting equipment, and realizing rapid impact rotary drilling of hard rocks such as large boulders, boulders, and pebbles.

[0005] The technical solution of the present invention is as follows: a pulse hydraulic impactor includes an outer tube, an impact hammer, a hexagonal anvil, a hexagonal sleeve, and an upper connector with an inner hole; one end of the outer tube is fitted onto the upper connector, and the other end is fitted onto the hexagonal sleeve; the hexagonal anvil passes through the hexagonal sleeve, and the hexagonal anvil is provided with a damping channel for maintaining the hydraulic pressure of the pulse slurry in the outer tube and a main channel for supplying the pulse slurry flow;

[0006] The impact hammer has a main channel inside. The impact hammer is fitted inside the outer tube, and one end of the impact hammer is inserted into the upper connector, so that the main channel is connected to the inner hole of the upper connector. The impact hammer can be moved axially back and forth relative to the outer tube and the upper connector, so that the other end of the impact hammer is locked on the hexagonal anvil to block the main channel. The main channel is connected to the damping channel. Alternatively, the other end of the impact hammer is spaced apart from the hexagonal anvil, and the main channel is connected to both the main channel and the damping channel.

[0007] The above scheme fully integrates the slurry pulse flow characteristics in pulse grouting technology and innovatively proposes an impactor structure that can cyclically press and thrust the impact hammer according to the slurry pulse frequency.

[0008] Designing a damping channel in the hexagonal anvil can achieve a certain throttling effect. When the pulse slurry flow rate is at its maximum (and the slurry pressure is at its maximum), due to the small diameter of the damping channel, the pulse slurry cannot be discharged to the bottom of the hole in time, and most of the slurry fluid will enter the bottom of the impact hammer, pushing the impact hammer compression spring upward. When the pulse slurry flow rate decreases (and the slurry pressure decreases), the spring pushes the impact hammer downward to do work, and the slurry displaced during the impact process flows into the bottom of the down-the-hole drill bit through the damping orifice.

[0009] The main function of the damping channel is to prevent the pressure from being released immediately when the slurry pressure increases, thereby pushing the impact hammer to compress the spring. At the same time, it is also necessary to ensure that the central channel is always unobstructed to prevent the slurry from being unable to flow out and becoming suffocated.

[0010] Preferably, one end of the hexagonal anvil extends into the outer tube, and an inclined first channel and an axially extending second channel are provided in that end of the hexagonal anvil; the other end of the hexagonal anvil extends out of the outer side of the hexagonal sleeve, and an axially extending third channel is provided in that end of the hexagonal anvil; the second channel is a damping orifice, which is axially connected with the third channel to form the damping channel, and the first channel connects the second channel and the third channel to form the main channel.

[0011] The above structural design, combined with the axial movement path of the impact hammer, facilitates the placement of the first channel for pulsed slurry flow.

[0012] Preferably, the hexagonal anvil comprises a first part, a second part, a third part, and a fourth part connected in sequence; the third part is slidably connected to the hexagonal sleeve; the second part is adapted to the inner wall of the outer tube, and the second part is provided with the first channel; the first part is clearance-fitted with the inner wall of the outer tube, and the clearance communicates with the first channel; the second channel is located inside the first part and the second part; the fourth part extends outward from the outer side of the hexagonal sleeve, and the third channel extends from the fourth part into the second part and communicates with the second channel and the first channel; the end of the impact hammer is provided with a sleeve, which can be inserted into the first part when axially displaced to block the first channel.

[0013] The impact hammer can block or open the first channel through the sleeve structure designed on the impact hammer and the hexagonal anvil assembly, effectively achieving continuous and effective impact on the down-the-hole drill bit.

[0014] Preferably, the first, second, and fourth parts are cylindrical, and the third part is a hexagonal body or a spline that slides with the hexagonal sleeve.

[0015] The hexagonal sleeve and hexagonal anvil are connected by a hexagonal or spline sliding joint to allow axial sliding between them. When the drilling and grouting equipment rotates, the outer tube (i.e., the drill rod) drives the hexagonal sleeve to rotate, which in turn drives the hexagonal anvil to rotate, causing the down-the-hole drill bit to rotate and break the rock. At the same time, the impact hammer continuously impacts the hexagonal anvil, thus transferring the impact energy to the down-the-hole drill bit to break the rock. If the hexagonal anvil and hexagonal sleeve cannot slide axially, for example, if they are connected by threads, the impact energy of the impact hammer will be transferred to the hexagonal sleeve through the threads, preventing the impact energy from being effectively transferred to the drill bit to break the rock.

[0016] Preferably, the first channel has n channels at the tail end, where n > 4 and is an even number. This numerical design allows for better formation of pulse slurry pressure relief channels, ensuring that the pulse slurry flows evenly and promptly to the bottom of the channel.

[0017] Preferably, the second and third parts are decreasing stepped shafts, such that the second part has a stepped surface, and the stepped surface and the end face of the hexagonal sleeve form a stroke L for axial displacement of the hexagonal anvil.

[0018] Design a suitable stroke so that when the drill bit is breaking rocks, it can make a certain range of up-and-down reciprocating impacts as needed, so as to achieve continuous and effective impacts, and further enable rapid impact and rotary drilling of hard rocks such as large boulders, boulders, and pebbles.

[0019] Preferably, the impact hammer is a stepped shaft, with its small-diameter end inserted into the upper connector and its large-diameter end fitted into the outer tube; a spring is fitted on the small-diameter end; the spring abuts against the stepped end face of the upper connector and the large-diameter end.

[0020] Preferably, the upper connector is threaded to the outer pipe; the hexagonal sleeve is threaded to the outer pipe; and the hexagonal anvil is threaded to the down-the-hole drill bit.

[0021] This invention also provides a method for integrated drilling and grouting pulse grouting, wherein pulse grout is injected into the aforementioned pulse hydraulic impactor, causing the down-the-hole drill bit connected to the hexagonal anvil of the pulse hydraulic impactor to operate; when the pulse pressure increases, the impact hammer presses upward, the impact hammer and the hexagonal anvil are spaced apart, and the pulse grout enters the end of the down-the-hole drill bit through the main channel from the first channel, the second channel and the third channel respectively; when the pulse pressure decreases, the impact hammer impacts the hexagonal anvil downward, and the impact hammer blocks the first channel, and the pulse grout enters the end of the down-the-hole drill bit through the main channel, the second channel and the third channel; the upward and downward grouting are repeated in a cycle.

[0022] Preferably, pulse slurry is injected into the pulse hydraulic impactor using a drilling and grouting tool, and the drilling and grouting tool is threadedly connected to the upper connector of the pulse hydraulic impactor.

[0023] Compared with related technologies, the beneficial effects of the present invention are as follows:

[0024] 1. When performing integrated drilling and grouting pulse grouting construction, the pulse hydraulic impactor can cyclically press and thrust the impact hammer according to the specific pulse frequency of the pulse grout, thereby continuously and effectively impacting the drill bit at the bottom of the drilling and grouting equipment, and realizing rapid impact rotary drilling of hard rocks such as large boulders, boulders, and pebbles.

[0025] Second, it effectively solves the technical problem that the existing hydraulic impactor cannot be used in the "drilling and grouting integration, pulse grouting" technology due to the pulse flow characteristics of the grout.

[0026] Third, the pulse hydraulic impactor of the present invention will make the "drilling and grouting integration, pulse grouting" technology safer, faster, more economical and effective for seepage prevention and consolidation grouting construction in complex strata such as Quaternary overburden. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the pulse hydraulic impactor under pressure provided by the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the pulse hydraulic impactor during downward thrust provided by the present invention;

[0029] Figure 3 For along Figure 1 A schematic diagram of one embodiment of the AA cross-section;

[0030] Figure 4 For along Figure 1 A schematic diagram of another embodiment of the AA cross-section.

[0031] In the attached diagram: 1. Upper connector; 2. Spring; 3. Outer tube; 4. Impact hammer; 41. Main channel; 42. Sleeve; 5. Hexagonal anvil; 51. First channel; 52. Second channel; 53. Third channel; 54. First part; 55. Second part; 56. Third part; 6. Hexagonal sleeve. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0033] like Figure 1 As shown, the pulse hydraulic impactor provided in this embodiment includes an upper connector 1, an outer tube 3, an impact hammer 4, a hexagonal anvil 5, and a hexagonal sleeve 6.

[0034] The upper end of the upper connector 1 is threaded to the drilling and grouting equipment, and the lower end is threaded to the upper end of the outer pipe 3. The lower end of the outer pipe 3 is threaded to the hexagonal sleeve 6. The upper connector 1 has an inner hole.

[0035] The impact hammer 4 is a stepped cylindrical shaft, with its small-diameter end inserted into the upper connector 1 (using a piston-like fitting structure), and its large-diameter end fitted into the outer tube 3 (also using a piston-like fitting structure). A spring 2 is fitted onto the small-diameter end. The spring 2 abuts against the upper connector 1 and the stepped end face of the large-diameter end. The impact hammer 4 has a main channel 41 inside. A sleeve 42 protrudes from the end of the large-diameter end of the impact hammer 4 (i.e., the lower end of the impact hammer 4).

[0036] The hexagonal anvil 5 includes a first part 54, a second part 55, a third part 56, and a fourth part 57 connected in sequence. The third part 56 is slidably connected to the hexagonal sleeve 6, and the third part 56 is a hexagonal body (e.g., a hexagonal body that slidably engages with the hexagonal sleeve 6) Figure 3 (As shown). Alternatively, the two are connected by a spline to form an axial sliding connection between the spline sleeve (the corresponding position on the hexagonal sleeve 6) and the spline (third part 56) (as shown). Figure 4 (As shown). It can both transmit torque and ensure axial sliding between the hexagonal anvil 5 and the hexagonal sleeve 6.

[0037] The second part 55 and the first part 54 extend into the outer tube 3, and a second channel 52 is provided inside the first part 54 and the second part 55. The second channel 52 is a damping orifice.

[0038] The second part 55 is adapted to the inner wall of the outer tube 3, and the second part 55 is provided with n inclined first channels 51, where n > 4 and is an even number. In this embodiment, n = 6, and the diameter of the first channel 51 is 8 mm.

[0039] Both the second part 55 and the first part 54 are cylindrical, and the diameter of the first part 54 is smaller than the diameter of the second part 55. The first part 54 is clearance-fitted with the inner wall of the outer tube 3, and this clearance communicates with the first channel 51. The fourth part 57 extends outward from the hexagonal sleeve 6, and the third channel 53 extends from the fourth part 57 into the second part 55 and communicates axially with the second channel 52. At the same time, the inclined first channel 51 also communicates with the third channel 53.

[0040] The second channel 52 and the third channel 53 are axially connected to form a damping channel, and the first channel 51 connects the second channel 52 and the third channel 53 to form the main channel for the pulse slurry to enter and exit the bottom of the downhole drill bit.

[0041] The fourth part 57 is cylindrical with external threads on its outer surface for threaded mounting of a down-the-hole drill bit (not shown). The second part 55 and the third part 56 are decreasing stepped shafts, giving the second part 55 a stepped surface. This stepped surface and the end face of the hexagonal sleeve 6 form a stroke L for the axial displacement of the hexagonal anvil 5. This stroke L provides a reciprocating impact during drill bit operation, enabling continuous and effective drilling.

[0042] The impact hammer 4 is a stepped shaft, with its small-diameter end inserted into the upper connector 1 and its large-diameter end fitted into the outer tube 3. A sleeve 42 protrudes from the end of the large-diameter end. A spring 2 is fitted onto the small-diameter end. The spring 2 abuts against the upper connector 1 and the stepped end face of the large-diameter end. The main channel 41 of the installed impact hammer 4 is connected to the inner hole of the upper connector 1. The sleeve 42 is adapted to the first part 54. When the impact hammer 4 is axially displaced, the sleeve 42 can be inserted into the first part 54, so that the sleeve 42 blocks the first channel 51. After blocking, the main channel 41, the second channel 52, and the third channel 53 are connected (e.g., Figure 2 (As shown). Alternatively, the sleeve 42 of the impact hammer 4 is spaced apart from the hexagonal anvil 5, opening the first channel 51, so that one end of the second channel 52 communicates with the main channel 41 through the gap between the first part 54 and the inner wall of the outer tube 3, and the other end of the second channel 52 communicates with the third channel 53. At the same time, the damping channel is also connected (as shown). Figure 1 (As shown).

[0043] The diameter of the second channel 52 is 3-6 mm, determined based on pulse quantity and impact stroke tests. The diameter of the first channel 51 is 6-10 mm, and the diameter of the third channel 53 is larger than that of the first channel 51.

[0044] like Figure 1 , Figure 2 As shown, this invention also provides a method for integrated drilling and grouting pulse grouting, in which pulse grout is injected into the aforementioned pulse hydraulic impactor using a drilling and grouting machine. When the pulse pressure increases to its maximum value, the impact hammer presses upward, and the impact hammer and the hexagonal anvil are spaced apart. The pulse grout enters the end of the down-the-hole drill bit through the main channel, the first channel, the second channel, and the third channel respectively. When the pulse pressure decreases to its minimum value, the impact hammer impacts the hexagonal anvil downward, and the impact hammer blocks the first channel. The pulse grout enters the end of the down-the-hole drill bit through the main channel, the second channel, and the third channel. This process repeats, with the pulse grout cyclically pressing and impacting the impact hammer according to the pulse frequency, continuously and effectively impacting the drill bit at the bottom of the drilling and grouting machine, achieving rapid impact rotary drilling of hard rocks such as large boulders, boulders, and pebbles.

[0045] When the pulse slurry flow rate is at its maximum (and the slurry pressure is at its maximum), due to the small diameter of the damping orifice (second channel 52), the pulse slurry cannot flow to the bottom of the down-the-hole drill bit in time. Most of the slurry fluid will enter the bottom of the impact hammer, pushing the impact hammer compression spring upward. When the pulse slurry flow rate decreases (and the slurry pressure decreases), the spring pushes the impact hammer downward to do work. The slurry displaced during the impact process flows into the bottom of the down-the-hole drill bit through the damping orifice.

[0046] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A pulsed hydro-impinger characterized in that, The utility model relates to a kind of pulse pressure vessel, including outer tube (3), impact hammer (4), hexagonal anvil (5), hexagonal sleeve (6) and upper joint (1) with inner hole;The outer tube (3) is sleeved on the upper joint (1) in one end, and is sleeved on the hexagonal sleeve (6) in other end;The hexagonal anvil (5) is threaded the hexagonal sleeve (6), and the hexagonal anvil (5) is equipped with the damping passage for keeping the pulse slurry pressure in outer tube (3) inside and the main passage for pulse slurry flow; The impact hammer (4) is equipped with main hole (41) inside, the impact hammer (4) is sleeved in the outer tube (3), and the impact hammer (4) is inserted in the upper joint (1) in one end, so that the main hole (41) is communicated with the inner hole of upper joint (1);The impact hammer (4) can be axially reciprocating displacement relative to outer tube (3) and upper joint (1), to make the other end of the impact hammer (4) be clamped on the hexagonal anvil (5) and block the main passage, the main hole (41) is communicated with damping passage, alternatively, the other end of the impact hammer is spaced apart from the hexagonal anvil (5), and the main hole (41) is communicated with main passage and damping passage simultaneously;The hexagonal anvil (5) is inserted into the outer tube (3) in one end, and is equipped with inclined first hole (51) in this end of hexagonal anvil (5), and is equipped with second hole (52) extending along the axial direction in this end;The other end of the hexagonal anvil (5) is extended outside the hexagonal sleeve (6), and is equipped with third hole (53) extending along the axial direction in this end of hexagonal anvil (5);The second hole (52) is damping eye, which is axially communicated with third hole (53) to form the damping passage, and the first hole (51) is communicated with the second hole (52) and third hole (53) to form the main passage;The hexagonal sleeve (6) and hexagonal anvil (5) are slidably connected to realize the axial sliding between the two.

2. The pulse hydro-impinger of claim 1, wherein, The hexagonal anvil (5) includes first part (54), second part (55), third part (56) and fourth part (57) communicated in sequence;The third part (56) is slidably connected with the hexagonal sleeve (6);The second part (55) is adapted with the inner wall of the outer tube (3), and the first hole (51) is arranged on the second part (55);The first part (54) is clearance fit with the inner wall of the outer tube (3), and the clearance is communicated with the first hole (51);The second hole (52) is located inside the first part (54) and the second part (55);The fourth part (57) is extended outside the hexagonal sleeve (6), and the third hole (53) is extended from the fourth part (57) to the second part (55) and communicated with the second hole (52) and the first hole (51);The end of the impact hammer (4) is provided with sleeve (42), and the sleeve (42) can be inserted on the first part (54) when axially displacing, to block the first hole (51).

3. The pulse hydro-impinger of claim 2, wherein, The first part (54), the second part (55) and the fourth part (57) are cylindrical, and the third part (56) is hexagonal or spline slidably fitted with the hexagonal sleeve (6).

4. The pulse jet impactor of claim 2, wherein, The first hole (51) is provided with n holes on the second part (55), n>4, and is even.

5. The pulse hydro-impinger of claim 2, wherein, The second part (55) and the third part (56) are decreasing step shafts, so that the second part (55) is formed with a stepped surface, which forms a stroke L for axial displacement of the hexagonal anvil (5) with the end surface of the hexagonal sleeve (6).

6. The pulsed hydro-impulsor of claim 1, wherein, The impact hammer (4) is a stepped shaft, the small diameter end of which is inserted into the upper joint (1), and the large diameter end of which is sleeved with the outer tube (3); the spring (2) is sleeved on the small diameter end. The spring (2) abuts against the stepped end surface of the upper joint (1) and the large diameter end.

7. The pulse jet impactor of claim 1, wherein, The upper joint (1) is threadedly connected with the outer tube (3); the hexagonal sleeve (6) is threadedly connected with the outer tube (3).

8. A method for drilling and grouting integrated pulse grouting, pulse slurry is pressed into the pulse hydro-impactor according to any one of claims 1-7, so that the down-the-hole drill connected with the hexagonal anvil of the pulse hydro-impactor works; when the pulse pressure increases, the impact hammer is pressed upward, the impact hammer is arranged in a spaced manner with the hexagonal anvil, and the pulse slurry enters the tail end of the down-the-hole drill through the main hole from the first hole, the second hole and the third hole respectively; when the pulse pressure decreases, the impact hammer impacts the hexagonal anvil downward, and the impact hammer blocks the first hole, and the pulse slurry enters the tail end of the down-the-hole drill through the main hole, the second hole and the third hole; the above reciprocating is repeated to perform cyclic upward pressing and downward impacting.

9. The method of claim 8, wherein, Pulse slurry is pressed into the pulse hydro-impactor through the drilling and grouting tool, and the drilling and grouting tool is threadedly connected with the upper joint of the pulse hydro-impactor. Pulse slurry is pressed into the pulse hydro-impactor through the drilling and grouting tool, and the drilling and grouting tool is threadedly connected with the upper joint of the pulse hydro-impactor.

Images