A high-pressure hole-drilling vibroflot

Abstract

The present invention relates to a high-pressure hole-drilling vibroflot, which comprises a vibroflot main body, a hydraulic system, a vibrohead, a water channel guard plate, a first water channel, and a hydraulic water pump driven by the hydraulic system. The side wall of the vibrohead is provided with a first water spraying hole communicated with the first water channel and a second water spraying hole communicated with the second water channel. When the high-pressure hole-drilling vibroflot is performing hole-drilling operation, the ratio of the output water pressure at the second water spraying hole to the output water pressure at the first water spraying hole is y, and y≥10. When performing hole-drilling operation, 8 strands of high-pressure water can be introduced into the interior of the vibroflot main body through a high-pressure hose, and finally high-pressure jet flows can be ejected from the second water spraying hole, so that a strong impact can be effectively exerted on the ground. Cooperating with the vibroflot hole-drilling process, the hole-making and hole-drilling effects can be effectively improved; it is especially suitable for hole-making and hole-drilling in pebble and cobble formations, and has high efficiency and good effects in hole-making and hole-drilling.

Description

Technical Field

[0001] The present invention relates to a high-pressure hole-drilling vibroflot, belonging to the technical field of vibroflots. Background Art

[0002] In civil construction projects, especially in vibroflotation gravel pile projects in water conservancy and hydropower projects, the main function of vibroflotation gravel piles is to densify soft strata or liquefiable sandy strata to improve the bearing capacity (mechanical properties) or liquefaction resistance of the foundation. However, the formation to be vibro-compacted itself or the overlying formation has relatively dense (hard) formations or complex formations such as boulders and solitary stones (referred to as sandy gravel formations), resulting in low hole-drilling efficiency of the vibroflot, or even being unable to directly drill through complex and hard formations. Instead, other equipment needs to be assisted (such as using an impact drill to drill holes) to penetrate the hard formation, and then the vibroflot is used to drill to the designed depth and then fill and vibrate to densify into piles. This method is the vibroflotation hole-drilling construction method.

[0003] Due to the problems of low hole-drilling efficiency, the need for other equipment assistance, and high construction costs of existing vibroflots when facing complex formations, they cannot meet the increasingly complex construction site requirements. To overcome this technical difficulty, the present invention is proposed. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the present invention provides a high-pressure hole-drilling vibroflot, and the specific technical solutions are as follows:

[0005] A high-pressure hole-drilling vibroflot includes a vibroflot main body, a hydraulic system, a vibrohead arranged at the lower end of the vibroflot main body, a water channel guard plate installed outside the vibroflot main body, and a first water channel located inside the vibroflot main body and the water channel guard plate. A first water spraying hole communicated with the first water channel is arranged on the side wall of the vibrohead. The high-pressure hole-drilling vibroflot further includes a hydraulic water pump driven by the hydraulic system. A second water channel is also arranged inside the vibroflot main body and the water channel guard plate. A high-pressure hose is connected between the second water channel and the hydraulic water pump. A second water spraying hole communicated with the second water channel is also arranged on the side wall of the vibrohead. The aperture of the second water spraying hole is smaller than that of the first water spraying hole;

[0006] When the high-pressure hole-drilling vibroflot is performing hole-drilling operations, the ratio of the output water pressure at the second water spraying hole to the output water pressure at the first water spraying hole is y, and y≥10.

[0007] For further improvement, the output water pressure at the second water spraying hole is 10 - 50 MPa, and the output water pressure at the first water spraying hole is 1 - 5 MPa.

[0008] For further improvement, the ratio of the number of the second water spraying holes to the number of the first water spraying holes is n, and n is a positive integer.

[0009] For further improvement, there are 8 second water spray holes and 4 first water spray holes.

[0010] For further improvement, a backpressure valve for adjusting the output water pressure or controlling the on / off of water flow is installed at the second water spray hole.

[0011] For further improvement, the backpressure valve includes a plurality of first perforated bolts threadedly connected to the second water spray holes and non-perforated bolts threadedly connected to the second water spray holes, and a first through hole is provided in the center of the first perforated bolts.

[0012] For further improvement, the backpressure valve includes a second perforated bolt threadedly connected to the second water spray hole. A frustum cavity is further provided at the vibration head. The small end of the frustum cavity communicates with the second water spray hole. A frustum-shaped boss is provided at the center of the large end of the frustum cavity. A plurality of communicating water channels are provided between the large end of the frustum cavity and the second water channel. The cone angle of the frustum cavity is an acute angle, and the cone angle of the boss is an obtuse angle. The small end of the boss is aligned with the screw rod of the second perforated bolt, and a groove matching the screw rod of the second perforated bolt is provided at the center of the small end of the boss; a second through hole is provided in the center of the second perforated bolt.

[0013] For further improvement, the cone angle of the frustum cavity is 64° and the cone angle of the boss is 116°.

[0014] For further improvement, when the high-pressure hole-leading vibroflot is performing hole-leading operation on the sandy gravel stratum, when the fractal dimension of the sandy gravel stratum is less than or equal to 2.5:

[0015] The maximum output water pressure at the second water spray hole is 20 MPa, and the maximum output water pressure at the first water spray hole is 1 MPa.

[0016] For further improvement, when the high-pressure hole-leading vibroflot is performing hole-leading operation on the sandy gravel stratum, when the fractal dimension of the sandy gravel stratum is less than or equal to 2.5 and the volume fraction of large pebbles in the sandy gravel stratum is greater than or equal to 17%, large pebbles refer to pebbles with a maximum diameter exceeding 7.62 cm;

[0017] Each first water spray hole and two second water spray holes form a water spray hole group, and there are a total of four water spray hole groups; in a single water spray hole group, the two second water spray holes and a single first water spray hole form an isosceles triangle structure;

[0018] The output water pressure at the first water spray hole is 0.6 - 0.8 MPa;

[0019] In each group of water spray holes, the first second water spray hole is marked as a constant-pressure water spray hole, and the output water pressure of the constant-pressure water spray hole is constant; the second second water spray hole is marked as a variable-pressure water spray hole, and the output water pressure of the variable-pressure water spray hole fluctuates within the range of 18 - 22 MPa, and the time-domain curve graph of the output water pressure is a sharp pulse waveform. The period value of the change in the output water pressure of the variable-pressure water spray hole does not exceed 12 s.

[0020] The four groups of water spray holes are arranged in a clockwise direction, and the output water pressures of the constant-pressure water spray holes in the four groups of water spray holes are arranged in a decreasing order in the clockwise direction.

[0021] Advantages of the present invention:

[0022] 1. When the high-pressure hole-leading vibroflot is performing hole-leading operations, 8 high-pressure water streams can be introduced into the main body of the vibroflot through the high-pressure hose, and finally high-pressure jets can be ejected from the second water spray holes, so as to effectively cause a strong impact on the ground. Cooperating with the vibroflot hole-leading process, it can effectively improve the hole-making and hole-leading effects.

[0023] 2. The high-pressure jets ejected from the second water spray holes and the conventional jets (the water flows generated during hole-making and hole-leading by existing vibroflots) ejected from the first water spray holes, these two jets with "one large and one small" water pressure magnitudes can cooperate with each other, especially suitable for hole-making and hole-leading in sandy pebble strata, and the hole-making and hole-leading efficiency is high and the effect is good. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the high-pressure hole-leading vibroflot described in Embodiment 1;

[0025] Figure 2 It is a schematic connection diagram of the vibroflot main body, the vibroflot head, and the water channel guard plate described in Embodiment 1;

[0026] Figure 3 It is a schematic distribution diagram of the second water channel and the second water spray holes described in Embodiment 1;

[0027] Figure 4 It is a schematic structural diagram of the backpressure valve described in Embodiment 6. Detailed Embodiments

[0028] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present 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, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Embodiment 1

[0031] As Figure 1 、 2 As shown, the high-pressure hole-drilling vibroflot includes a vibroflot main body 10, a hydraulic system, a vibrohead 12 provided at the lower end of the vibroflot main body 10, a water channel guard plate 11 installed outside the vibroflot main body 10, and a first water channel 112 located inside the vibroflot main body 10 and the water channel guard plate 11. A first water spray hole 121 communicating with the first water channel 112 is provided on the side wall of the vibrohead 12.

[0032] Structures such as the vibroflot main body 10, the hydraulic system, the vibrohead 12, the water channel guard plate 11, the first water channel 112, and the first water spray hole 121 are all components of the existing vibroflot. Generally, two water channel guard plates 11 are provided in the existing vibroflot. The first water channel 112 is communicated with an external water pump through a hose. The water pump pumps water into and through the first water channel 112, and finally can be sprayed out from the first water spray hole 121, which can be used for hole cleaning. To ensure the flow rate, the aperture of the first water spray hole 121 is usually greater than 1 cm; the output water pressure at the first water spray hole 121 in the existing vibroflot is 0.5 - 2 MPa, and at most does not exceed 5 MPa. The main function of the water channel guard plate 11 is to facilitate the arrangement of the first water channel 112 because there are components such as a main shaft and an eccentric block inside the lower part of the vibroflot main body 10, which cannot be used to set the first water channel 112.

[0033] As Figures 1 - 3As shown, the high-pressure hole-drilling vibroflot further includes a hydraulic water pump driven by a hydraulic system. A second water channel 111 is also provided in the vibroflot main body 10 and the water channel guard plate 11. A high-pressure hose is connected between the second water channel 111 and the hydraulic water pump. A second water spray hole 122 communicating with the second water channel 111 is further provided on the side wall of the vibration head 12. The aperture of the second water spray hole 122 is smaller than that of the first water spray hole 121.

[0034] When the high-pressure hole-drilling vibroflot is performing hole-drilling operations, the ratio of the output water pressure at the second water spray hole 122 to the output water pressure at the first water spray hole 121 is y, and y≥10.

[0035] In this example, 8 second water spray holes 122 are provided, and 4 first water spray holes 121 are provided. Correspondingly, 4 water channel guard plates 11 and first water channels 112 are provided, and 8 second water channels 111 and hydraulic water pumps are also provided.

[0036] When the high-pressure hole-drilling vibroflot is performing hole-drilling operations, 8 high-pressure water flows can be introduced into the interior of the vibroflot main body 10 through the high-pressure hose and connected to 8 second water channels 111. Finally, high-pressure jets can be ejected from the second water spray holes 122, so as to effectively cause strong impact on the ground. In cooperation with the vibroflot hole-drilling process, the hole-making and hole-drilling effects can be effectively improved.

[0037] In practical applications, to ensure the impact effect of the high-pressure jet, the output water pressure at the second water spray hole 122 is 10~50 MPa, and the aperture of its output hole is 1~3 mm. The high-pressure water generated can cut the soil layer and sand layer and achieve the purpose of breaking the formation.

[0038] The output water pressure at the first water spray hole 121 is 1~5 MPa. The jets with "one large and one small" water pressure magnitudes can cooperate with each other, and they have the best hole-making and hole-drilling effects on the cobblestone formation.

[0039] In the prior art, the diameter of the water jet nozzle is generally 0.1 mm - 0.4 mm, and the water pressure inside the water jet nozzle is usually 100~600 MPa. Even when using a water jet, its cutting effect on cobblestones is limited because some cobblestones are too thick. Even if they are cut into small pieces, if they cannot be transported away in time, they will still pose a huge obstacle to the vibroflot hole-drilling.

[0040] Further, to improve the wear resistance of the vibration head 12, a wear-resistant tip assembly is usually installed on the vibration head 12. Example 2

[0041] In Example 1, a back pressure valve for adjusting the output water pressure or controlling the on / off of the water flow is installed at the second water spray hole 122.

[0042] The backlog valve at the second water spray hole 122 can achieve a high-pressure jet output of 10 to 50 MPa. According to the usage requirements, the on / off and pressure magnitude of each high-pressure jet can be independently controlled by the backlog valve. Example 3

[0043] In Example 2, the backlog valve includes a plurality of first open-hole bolts 21 threadedly connected to the second water spray hole 122 and a non-open-hole bolt threadedly connected to the second water spray hole 122. A first through-hole is provided in the center of the first open-hole bolt 21, and the first through-hole is an output hole.

[0044] In this example, the backlog valve is composed of a first open-hole bolt 21 and a non-open-hole bolt. The non-open-hole bolt is an existing conventional bolt, and no first through-hole is provided in its center.

[0045] When it is necessary to close the second water spray hole 122, the second water spray hole 122 is closed by threadedly connecting the non-open-hole bolt to the second water spray hole 122, realizing the closing of the backlog valve.

[0046] When it is necessary to open the backlog valve, the non-open-hole bolt is replaced with the first open-hole bolt 21. The aperture of the first through-hole in different first open-hole bolts 21 can be set to different sizes according to needs; thus, by replacing the first open-hole bolt 21 corresponding to different aperture sizes of the first through-hole, the backlog valve can output high-pressure jets with different pressure magnitudes.

[0047] To ensure the high-pressure jet effect at the second water spray hole 122, the aperture of the first through-hole is usually 0.5 to 3.3 mm and can be adjusted according to needs. Example 4

[0048] Research shows that the particle size distribution of natural settlement sand and gravel strata satisfies the fractal structure, and the fractal dimension mostly concentrates between 2.3 and 2.87, and the fractal dimension of a few special geological conditions is greater than 2.9.

[0049] When the high-pressure hole-leading vibroflot is performing hole-leading operations on the sand and gravel strata, when the fractal dimension of the sand and gravel strata is less than or equal to 2.5, the following vibroflotation hole-leading construction process is carried out:

[0050] The maximum output water pressure at the second water spray hole 122 is 20 MPa, and the maximum output water pressure at the first water spray hole 121 is 1 MPa. During actual construction, the output water pressure can be finely adjusted according to geological conditions. In this example, the hole-making speed can reach 0.88 m / min.

[0051] When vibroflotation hole forming and pilot hole drilling are carried out in this kind of geology, since the volume of boulders and single stones in the sandy gravel stratum is generally small, most of them usually have a particle size less than 6 cm and are relatively evenly distributed. At this time, the high-pressure water output by the vibroflot is used to cut the soil layer, stone layer and sand layer. In addition, the large flow of water ejected from the first water spraying hole 121 will easily liquefy the area near the stratum. Coupled with the high-pressure water with a water pressure of 20 MPa ejected from the second water spraying hole 122, it can make the boulders / single stones float up under the impact in the liquefied environment, and then be flushed out of the hole mouth along with the broken soil and stone particles, finally realizing efficient and convenient vibroflotation pilot hole drilling and hole forming construction.

[0052] In this embodiment, vibroflotation construction is carried out on the dam foundation of a hydropower station in a certain place in Sichuan Province. A certain sandy gravel stratum belongs to alluvial accumulation, with a layer thickness of 13.2 - 17.4 m. The particle size of the pebbles is generally less than 6 cm, and the content is about 8%; the sand is grayish-yellow medium-fine sand, accounting for about 40%.

[0053] When hole forming is carried out, the hole forming current is 160 - 290 A, the densification current is 140 - 160 A, and the vibration retention time is 10 s. At the beginning, a conventional vibroflot (that is, the existing vibroflot without the second water spraying hole 122, 4 groups of water channel guard plates 11) is used. It is found that even when the hole forming water pressure is increased from 0.6 MPa to 5 MPa, the hole forming rate is very low. After continuous hole forming for 15 minutes, the hole depth does not exceed 2 m; when the pressure is continued to be increased and the hole forming water pressure is increased from 5 MPa to 7 MPa, it is found that the greater the hole forming water pressure, the worse the hole forming. The main reason is that the aperture of the first water spraying hole 121 is relatively large, and its water pressure is high. The greater the reaction force of the high-pressure water impacting the ground, the more it affects the exciting force of the vibroflot itself; if the method of reducing the first water spraying hole 121 is adopted, by binding a high-pressure water knife (the diameter of the water knife nozzle is 0.4 mm, and the water pressure in the water knife nozzle is 100 MPa) at the vibroflot head 12, first, the high-pressure water knife is easily worn. Second, although the cutting effect of the high-pressure water knife is very excellent, the cutting effect on boulders and single stones is almost non-existent, because the boulders and single stones are not fixed in the liquefied stratum, are not easy to be stressed, and the jet flow range ejected by the high-pressure water knife is very small, resulting in a large number of boulders and single stones still near the liquefied stratum and unable to be flushed up in large quantities. Example 5

[0054] In Example 4, for some special strata, for example, the dam foundation of a hydropower station in Sichuan Province, due to long-term impact by rivers, there are a large number of pebbles / boulders in some local areas of the dam foundation, and their volume is very large, generally with a maximum diameter of more than 7.62 cm; when the vibration and drilling process in Example 3 is used, it is found that due to a large number of large pebbles / boulders embedded in the muddy soil, the sand and gravel stratum is not easily recoiled to the hole mouth even under the impact of 20MPa high-pressure water, but will flow to the area with weak impact force and then sink, and finally there are very few large pebbles / boulders that are recoiled out of the hole mouth; since there are still many large pebbles / boulders, they pose a great obstacle to vibration and drilling; in the prior art, a rotary drilling machine is usually used to make holes.

[0055] Based on this, in the present embodiment, when the high-pressure drilling vibrator performs drilling operation on a gravel formation, when the fractal dimension of the gravel formation is 2.53-2.71 and the volume fraction of large pebbles in the gravel formation is 17%-21%, large pebbles refer to pebbles with a maximum diameter exceeding 7.62 cm, and the thickness of the gravel formation is 2.3-3.5 m.

[0056] For the gravel formation, it was found that even if the vibratory drilling process in Example 4 was used, it was found that the gravel formation could not be penetrated. When the hole depth was 0.4-0.5m, the current dropped significantly, the vibration weakened, and the progress was slow. When the hole depth reached about 0.7m, the hole-making speed was extremely slow, there was basically no footage, and the vibration was so severe that it was obvious that there were large stones. The vibrator could not go down.

[0057] This embodiment adopts the following vibro-punching hole-drawing process:

[0058] Each first water spray hole 121 and two second water spray holes 122 adjacent to the first water spray hole 121 form a water spray hole group, a total of four water spray hole groups; in a single water spray hole group, the two second water spray holes 122 and the single first water spray hole 121 form an isosceles triangle structure, such as Figure 2 As shown;

[0059] The output water pressure at the first water spray hole 121 is 0.6-0.8 MPa;

[0060] In each group of water spray holes, the first second water spray hole 122 is marked as a constant pressure type water spray hole, and the output water pressure of the constant pressure type water spray hole is constant; the second second water spray hole 122 is marked as a variable pressure type water spray hole, and the output water pressure of the variable pressure type water spray hole fluctuates within the range of 18-22MPa and the time domain curve of the output water pressure is a sharp pulse waveform, and the period value of the output water pressure change of the variable pressure type water spray hole does not exceed 12s;

[0061] The four groups of water spray hole groups are arranged clockwise, and the output water pressure of the constant-pressure water spray holes in the four groups of water spray hole groups decreases sequentially in the clockwise direction.

[0062] The output water pressure of the constant-pressure water spray holes in the first group of water spray hole groups is 20 MPa, the output water pressure of the constant-pressure water spray holes in the second group of water spray hole groups is 19.5 MPa, the output water pressure of the constant-pressure water spray holes in the third group of water spray hole groups is 19 MPa, and the output water pressure of the constant-pressure water spray holes in the fourth group of water spray hole groups is 18.5 MPa.

[0063] The time-domain curve graph of the output water pressure refers to the curve recorded by the change of the output water pressure with time, with the abscissa being time and the ordinate being the output water pressure value.

[0064] In this example, the hydraulic water pump corresponding to the variable-pressure water spray holes can be controlled by a frequency converter, and it is easier to obtain an output water pressure with a sharp pulse waveform in the time-domain curve graph; the hole-making speed in this example can reach 0.93 m / min. The reason is that the output water pressure of the constant-pressure water spray holes in the four groups of water spray hole groups decreases sequentially in the clockwise direction, so that in the liquefied formation, the impact forces at each place are different and can form a relay, resulting in the fluid in the area being able to flow in a similar rotational manner in an approximate clockwise or counterclockwise direction. Finally, the large pebbles roll out of the hole mouth in a rotating manner, significantly improving the hole-making and hole-leading effects.

[0065] Due to the layout limitation of the vibration head 12, for the convenience of processing and to make the layout reasonable to the greatest extent, the distribution positions of the four groups of water spray hole groups need to correspond to the water channel guard plate 11, which results in the eight second water spray holes 122 not being completely symmetrically distributed. Therefore, to ensure the "relay" effect brought by the high-pressure water impact, due to the stable water pressure of the constant-pressure water spray holes, it brings a strong and stable impact force, and for the variable-pressure water spray holes adjacent to the constant-pressure water spray holes, it can suddenly give a very strong impact to the large pebbles, so as to impact the large pebbles to the designated area. For large pebbles, if two very close constant-pressure water spray holes impact it, it is very easy to cause the large pebbles to be impacted into the deeper soil and it is more difficult to roll up. In the present invention, it is utilized that when the same large pebble is subjected to two unequal impact forces, it cannot maintain balance, so it can easily roll and flow in the designated direction. Comparative Example 1

[0066] In this example, if the output water pressure of the constant-pressure water spray holes in the four groups of water spray hole groups is all 20 MPa, and the rest are the same as in Example 5; the fractal dimension of the sandy pebble formation is 2.51 - 2.68 and the volume fraction of large pebbles in the sandy pebble formation is 18% - 20%, and the thickness of the sandy pebble formation is 1.7 - 2.6 m; the final hole-making speed is 0.55 m / min. Comparative Example 2

[0067] In this example, if the output water pressure of the variable-pressure water spray holes fluctuates within the range of 18 - 22 MPa and the time-domain curve graph of the output water pressure is triangular wave-shaped, and the rest are the same as in Example 5; the fractal dimension of the sandy pebble stratum is 2.58 - 2.73 and the volume fraction of large pebbles in the sandy pebble stratum is 18% - 25%, and the thickness of this sandy pebble stratum is 2.5 - 3.8 m; for the deeper stratum after 4 m, its fractal dimension is 2.38 - 2.47; the final hole-making speed is 0.72 m / min, but when the hole depth during construction reaches below 8.1 m, the phenomenon of pile hugging occasionally occurs, affecting the hole-making; at this time, it is found that even if the time-domain curve graph of the output water pressure is adjusted to a stepped waveform, the phenomenon of pile hugging still occurs intermittently; until the time-domain curve graph of the output water pressure is adjusted to the sharp pulse waveform in Example 5, the phenomenon of pile hugging disappears. Comparative Example 3

[0068] In this example, if the two second water spray holes 122 and the single first water spray hole 121 are arranged in a straight line, and the rest are the same as in Example 5; the fractal dimension of the sandy pebble stratum is 2.61 - 2.77 and the volume fraction of large pebbles in the sandy pebble stratum is 18% - 20%, and the thickness of this sandy pebble stratum is 2.8 - 3.5 m; during vibroflotation hole-making, it is found that the main body 10 of the vibroflot drifts severely, resulting in the hole position deviation during vibroflotation hole-making exceeding the design value (the hole position deviation is greater than 5 cm, and the diameter of the pilot hole is 80 cm).

[0069] However, there is no hole position deviation in Example 5. Moreover, in Example 4, even if the two second water spray holes 122 and the single first water spray hole 121 are arranged in a straight line, there is no hole position deviation; mainly because the water pressure of the high-pressure water in Example 4 is constant and the force is relatively uniform. Example 6

[0070] In Example 3, since the operation of adjusting the output water pressure of the backpressure valve is rather troublesome, and the adjustment scale accuracy is poor, and at the same time a large number of first opening bolts 21 need to be prepared, the usage limitations are relatively large. Therefore, improvement is needed.

[0071] Such as Figure 4As shown, the backlog valve includes a second opening bolt 22 threadedly connected to the second water spray hole 122. A frustum cavity 113 is further provided at the vibration head 12. The small end of the frustum cavity 113 communicates with the second water spray hole 122. A frustum-shaped convex platform 114 is provided at the center of the large end of the frustum cavity 113. A plurality of communicating water channels 1111 are provided between the large end of the frustum cavity 113 and the second water channel 111. The cone angle of the frustum cavity 113 is an acute angle, and the cone angle of the convex platform 114 is an obtuse angle. The small end of the convex platform 114 is aligned with the screw rod of the second opening bolt 22. A groove 115 matching the screw rod of the second opening bolt 22 is provided at the center of the small end of the convex platform 114; a second through hole is provided at the center of the second opening bolt 22, and the second through hole is an output hole.

[0072] In this example, when the second opening bolt 22 is turned so that the screw rod of the second opening bolt 22 abuts against the bottom of the groove 115, the backlog valve is in a closed state at this time; the setting of the groove 115 makes it less likely to leak water when in the closed state.

[0073] By turning the second opening bolt 22, a certain gap is formed between the screw rod of the second opening bolt 22 and the groove 115. In this way, the high-pressure water from the communicating water channels 1111 will sequentially pass through the inclined channel 116 and the gap between the screw rod of the second opening bolt 22 and the groove 115, and finally enter the second through hole and be ejected from the second through hole; the output water pressure of the backlog valve can be adjusted by adjusting the size of the gap between the screw rod of the second opening bolt 22 and the groove 115.

[0074] Among them, if the cone angle of the frustum cavity 113 is equal to the cone angle of the convex platform 114, the inclined channel 116 will become a channel with an unchanged inner diameter, and the output water pressure brought by it is poor. Because, in this embodiment, since the inner diameter of the inclined channel 116 becomes larger in the direction away from the communicating water channels 1111, the flow rate becomes faster, and the corresponding water pressure decreases, and then enters the gap between the screw rod of the second opening bolt 22 and the groove 115, and the water pressure becomes larger again. In this way, a small change in the gap between the screw rod of the second opening bolt 22 and the groove 115 can cause a large change in the final output water pressure. Considering the volume of the second opening bolt 22, the pitch of the thread, etc., preferably, the cone angle of the frustum cavity 113 is 64°, and the cone angle of the convex platform 114 is 116°. In this way, only by turning one circle can a change in the output water pressure of about 0.5 MPa be achieved, and the practicability is stronger.

[0075] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-pressure hole-guiding vibrator, comprising a vibrator body (10), a hydraulic system, a vibrator head (12) arranged at the lower end of the vibrator body (10), a waterway guard plate (11) installed outside the vibrator body (10), and a first water channel (112) located in the vibrator body (10) and the waterway guard plate (11), wherein a first water spray hole (121) connected to the first water channel (112) is arranged on a side wall of the vibrator head (12), and characterized in that: It also includes a hydraulic water pump driven by a hydraulic system, a second water channel (111) is provided in the vibrator body (10) and the water channel guard plate (11), a high-pressure hose is connected between the second water channel (111) and the hydraulic water pump, and a second water spray hole (122) connected to the second water channel (111) is provided on the side wall of the vibrator head (12), the aperture of the second water spray hole (122) being smaller than the aperture of the first water spray hole (121); When the high-pressure hole-guiding vibrator is performing a hole-guiding operation, the ratio of the output water pressure at the second water spray hole (122) to the output water pressure at the first water spray hole (121) is y, and y≥10; The second water spray holes (122) are provided in eight numbers, and the first water spray holes (121) are provided in four numbers; The high pressure drilling vibrator is used for drilling in sandy and gravel formations: When the fractal dimension of the sand and gravel formation is less than or equal to 2.5, the maximum output water pressure at the second water spray hole (122) is 20 MPa, and the maximum output water pressure at the first water spray hole (121) is 1 MPa; or, When the fractal dimension of the sand-pebble formation is less than or equal to 2.5 and the volume fraction of large pebbles in the sand-pebble formation is greater than or equal to 17%, the large pebbles refer to pebbles with a maximum diameter exceeding 7.62 cm; each first water spray hole (121) and two second water spray holes (122) form a water spray hole group, and there are four water spray hole groups in total; in a single water spray hole group, the two second water spray holes (122) and the single first water spray hole (121) form an isosceles triangle structure; the first water spray hole The output water pressure at the hole (121) is 0.6-0.8 MPa; in each group of water spray holes, the first second water spray hole (122) is marked as a constant pressure type water spray hole, and the output water pressure of the constant pressure type water spray hole is constant; the second second water spray hole (122) is marked as a variable pressure type water spray hole, and the output water pressure of the variable pressure type water spray hole fluctuates within the range of 18-22 MPa and the time domain curve of the output water pressure is a sharp pulse waveform, and the period value of the output water pressure change of the variable pressure type water spray hole does not exceed 12 s; The four groups of water spray holes are arranged in a clockwise direction, and the output water pressures of the constant pressure type water spray holes in the four groups of water spray holes are set to decrease in sequence in a clockwise direction.

2. A high-pressure hole-drawing vibrator according to claim 1, characterized in that: A pressure valve for adjusting the output water pressure or controlling the interruption of water flow is installed at the second water spray hole (122).

3. A high-pressure hole-drawing vibrator according to claim 2, characterized in that: The backlog valve comprises a plurality of first hole-opening bolts (21) threadedly connected to the second water spray hole (122), and a hole-free bolt threadedly connected to the second water spray hole (122), wherein a first through hole is provided at the center of the first hole-opening bolt (21).

4. A high-pressure hole-guiding vibrator according to claim 2, characterized in that: The backlog valve comprises a second opening bolt (22) threadedly connected to the second water spray hole (122); a truncated cone cavity (113) is further provided at the vibrator head (12); the small end of the truncated cone cavity (113) is communicated with the second water spray hole (122); a truncated cone-shaped boss (114) is provided at the center of the large end of the truncated cone cavity (113); a plurality of communicating water channels (1111) are provided between the large end of the truncated cone cavity (113) and the second water channel (111); the cone angle of the truncated cone cavity (113) is an acute angle; the cone angle of the boss (114) is an obtuse angle; the small end of the boss (114) is aligned with the screw of the second opening bolt (22); a groove (115) matching the screw of the second opening bolt (22) is provided at the center of the small end of the boss (114); and a second through hole is provided at the center of the second opening bolt (22).

5. A high-pressure hole-drawing vibrator according to claim 4, characterized in that: The cone angle of the truncated cone cavity (113) is 64°, and the cone angle of the boss (114) is 116°.

Images