A hydraulic drilling system and construction method for drilling while following a pipe pile

Abstract

The application discloses a hydraulic drilling system and construction method for drilling while following a pipe pile, which comprises a pipe pile, a spiral drill rod, a jet suction pipe and a drill bit; the spiral drill rod is rotatably installed in the pipe pile, one end of the spiral drill rod penetrates through the pipe pile and is sequentially connected with the jet suction pipe and the drill bit; wherein the spiral drill rod is a hollow structure and is connected with a mud pump for inputting clean water at the top end; the jet suction pipe is in communication with the spiral drill rod and the drill bit; a jet suction cavity is formed in the jet suction pipe, and a suction inlet is arranged on the jet suction cavity; when the jet suction pipe transmits clean water, the jet suction cavity can form a negative pressure chamber to suck broken particles formed in the drilling process through the suction inlet, so that the broken particles and the clean water form an abrasive water jet; the drill bit is provided with a nozzle assembly. Through the above arrangement, the functions of efficiently cooling the drill bit and assisting rock breaking and chip removal can be realized by only inputting clean water, the efficiency of hard rock drilling is improved, the service life of equipment is prolonged, the construction system is simplified and the purpose of environmental protection and no pollution is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of drilling while casing pile, in particular to a hydraulic drilling system for drilling while casing pile and a construction method. BACKGROUND

[0002] The drilling while casing pile technology is widely used in infrastructure construction, and the existing drilling while casing pile drilling method is mainly dry drilling method, and the service life of the drill bit, drilling efficiency and pile quality in hard rock formation are not ideal. The circulating flushing fluid can cool the drill bit, carry the cuttings, assist in rock breaking and maintain the stability of the hole wall. The traditional hydraulic drilling system mainly uses mud or clean water as the flushing fluid, but both of them have certain disadvantages when used as the flushing fluid.

[0003] When mud is used as the flushing fluid, although its high viscosity can effectively carry the cuttings and cool the drill bit through fluid circulation, it needs to be equipped with an expensive and large solid control system to control the solid particle content in the mud and the flow performance of the mud, thereby increasing the cost of the construction equipment. Moreover, due to the frequent movement of the construction equipment with the hole position during the construction of the drilling while casing pile, the large solid control equipment is very difficult to move, resulting in very inconvenient operation. In addition, since the mud needs to be added with additives to ensure the flow performance of the mud when used, the additives in the mud will also pollute the formation, which does not meet the requirements of environmentally friendly construction.

[0004] When clean water is used as the flushing fluid, it has the advantages of low cost and green environmental protection, but it has the defect of insufficient cuttings carrying capacity due to its low viscosity, especially in the working condition of large annular space at the bottom of the drilling while casing pile hole, the upward flow rate of the flushing fluid is slow, and large particle cuttings are easily deposited at the bottom of the hole, causing repeated breaking of the drill bit, increasing energy consumption, and the cuttings cushion layer will reduce the bonding strength between the pile and the formation, affecting the bearing capacity. If the flow of clean water is increased to improve the cuttings carrying capacity, it will also cause the pressure at the bottom of the hole to rise, causing the flushing fluid to leak and wash the hole wall, damaging the side friction of the pile. In addition, clean water has poor wall protection performance due to its small density.

[0005] Therefore, a hydraulic drilling system for drilling while casing pile and a construction method are needed to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide a hydraulic drilling system for drilling while casing pile and a construction method, which can realize efficient cooling of the drill bit and auxiliary rock breaking and cuttings removal functions by only inputting clean water, thereby improving the hard rock drilling efficiency, prolonging the service life of the equipment, simplifying the construction system and achieving the purpose of environmental protection and no pollution.

[0007] To solve the above technical problems, the present application provides a hydraulic drilling system for drilling while casing pile, comprising a pile, a spiral drill rod, a jet suction pipe and a drill bit.

[0008] The spiral drill rod is rotatably installed inside the pipe pile, and one end of the spiral drill rod penetrates through the pipe pile and is connected with the jet suction pipe and the drill bit in sequence;

[0009] The spiral drill rod and the pipe pile are capable of moving synchronously in a direction perpendicular to the construction surface, and the spiral drill rod is a hollow structure and is connected with a slurry pump for inputting clean water at the top end opening;

[0010] The jet suction pipe is communicated with the spiral drill rod and the drill bit for transmission of clean water;

[0011] The jet suction pipe is provided with a suction inlet communicated with the external environment.

[0012] When the clean water flows through the jet suction pipe, the jet suction cavity can form a negative pressure chamber to suck the broken particles formed in the drilling process through the suction inlet, so that the broken particles are mixed with the clean water to form an abrasive water jet;

[0013] The drill bit has a nozzle assembly for spraying clean water and the abrasive water jet.

[0014] Further, the jet suction pipe comprises a pipe body, a jet nozzle and a throat pipe.

[0015] Both ends of the pipe body are detachably and sealingly connected with the spiral drill rod and the drill bit, respectively.

[0016] The jet nozzle and the throat pipe are sequentially arranged in the pipe body from the direction away from the spiral drill rod, and a gap is reserved between the output end of the jet nozzle and the throat pipe, so that the jet nozzle, the pipe body and the throat pipe surround a jet suction cavity capable of forming a negative pressure chamber.

[0017] Further, the drill bit comprises a cavity, an expanding reamer tooth plate and a bottom reamer tooth plate.

[0018] The expanding reamer tooth plate is rotatably installed on the outer wall of the cavity and has a folded state and an expanded state.

[0019] The folded state and the expanded state are switched by the rotation direction of the spiral drill rod and the reaction force received by the expanding reamer tooth plate when contacting the stratum.

[0020] When the expanding reamer tooth plate is in the folded state, the outer diameter of the drill bit is smaller than the inner diameter of the pipe pile.

[0021] The bottom reamer tooth plate is fixedly installed at the bottom of the cavity.

[0022] Further, the reaming pick plate is internally provided with a first flow channel and a jet nozzle communicating with the first flow channel;

[0023] An installation seat for installing the reaming pick plate is formed on the outside of the cavity, and the cavity and the installation seat are respectively provided with a second flow channel and a third flow channel communicating with each other;

[0024] When the reaming pick plate is in the expanded state, the first flow channel, the second flow channel and the third flow channel are sequentially communicated;

[0025] When the reaming pick plate is in the folded state, the third flow channel is disconnected from the first flow channel, and the outlet of the third flow channel is just directed to the rotating shaft of the reaming pick plate.

[0026] Further, a plurality of reaming pick plates are provided, and the plurality of reaming pick plates are arranged in a ring array centered on the axial center line of the cavity.

[0027] Further, the nozzle assembly comprises a first radial nozzle and a second radial nozzle arranged in the cavity;

[0028] The opening direction of the first radial nozzle is directed to the rotating connection position of the corresponding reaming pick plate and the cavity;

[0029] The opening direction of the second radial nozzle is directed to the direction to be operated when the corresponding reaming pick plate is operated;

[0030] When the reaming pick plate is in the folded state, the opening of the second radial nozzle is directed to the corresponding reaming pick plate;

[0031] The inner diameter of the first radial nozzle increases along the output direction, and the inner diameter of the second radial nozzle decreases along the output direction.

[0032] Further, the nozzle assembly further comprises an axial nozzle arranged in the cavity, for assisting the bottom pick plate in drilling operation.

[0033] Further, a sand removal cylinder is further included;

[0034] The sand removal cylinder is detachably fixed and installed on the end outer wall of the pipe pile, and the auger rod can transport the mixed liquid formed in the drilling process along the inner wall of the pipe pile to the sand removal cylinder;

[0035] A recovery port for recovering clean water in the mixed liquid is arranged on one side of the top end of the sand removal cylinder, and the mud pump is connected with the recovery port and the top end opening of the auger rod through a pipeline, for recycling the clean water;

[0036] The inner cavity bottom wall of the desanding cylinder is provided with an annular sand cavity for collecting the broken particles in the mixed liquid, and one side of the annular sand cavity is provided with a sand discharge port.

[0037] The inner wall of the desanding cylinder is further fixedly provided with helical blades arranged in the opposite direction of the upper blade of the spiral drill rod, for accelerating the separation and deposition of the broken particles in the mixed liquid.

[0038] Further, the hydraulic drilling system further comprises a drilling machine and a mud pool connected with the spiral drill rod.

[0039] The mud pool and the mud pump are fixed to the drilling machine, and the mud pool is in communication with the recovery port.

[0040] The mud pump is used for outputting the clean water input into the mud pool into the top opening of the spiral drill rod.

[0041] In another aspect, the present application further provides a construction method of the drill-in follow-up pile, which is realized by using the drill-in follow-up pile hydraulic drilling system described in the above embodiments, and specifically includes the following steps:

[0042] S1, the spiral drill rod is extended into the bottom of the pile;

[0043] S2, the spiral drill rod is controlled to rotate in a predetermined direction to drive the drill bit to operate synchronously to drill into the stratum;

[0044] S3, the clean water is output by the mud pump through the spiral drill rod hollow cavity into the jet suction cavity of the jet suction pipe, under the high pressure impact of the clean water, the jet suction cavity forms a negative pressure chamber to suck the broken particles formed in the drilling process through the suction port in real time, so that the broken particles and the clean water are mixed to form an abrasive water jet, and the abrasive water jet is sprayed out of the nozzle assembly of the drill bit to assist the drill bit in breaking rocks;

[0045] S4, the pile is controlled to move downward along the direction perpendicular to the construction surface following the spiral drill rod;

[0046] S5, when the pile is sunk to a preset depth, the spiral drill rod, the jet suction pipe and the drill bit are lifted away from the bottom of the hole.

[0047] Compared with the prior art, the present application has at least the following beneficial effects:

[0048] By setting the suction pipe with suction cavity and suction inlet, and making it communicate with the spiral drill pipe and drill bit with nozzle assembly, the broken particles formed in the drilling process can be automatically sucked in by the suction cavity negative pressure suction effect when the spiral drill pipe inputs clean water, and the broken particles can be mixed with clean water to form abrasive water jet and sprayed through the nozzle assembly of the drill bit, so as to improve the rock breaking ability of the drill bit by the characteristics of abrasive water jet, that is, to strengthen the rock breaking ability. In addition, the jet suction effect of the suction pipe can form a local circulation flow field at the bottom of the hole, thereby further improving the upward velocity of the mixed liquid formed by the broken particles and clean water, so as to prevent the deposition of rock debris and enhance the effect of carrying debris by clean water. In addition, the device replaces the application of mud as cleaning fluid in the prior art by clean water input and suction mechanism of suction pipe negative pressure, so that the mud pump does not directly contact the particles in the mud during the whole process, thereby avoiding the wear of the mud pump, achieving the purpose of improving the durability of the equipment, simplifying the construction equipment and eliminating the risk of mud pollution. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 It is a structural schematic diagram of a hydraulic drilling system for drill-in casing pile in an embodiment of the present application;

[0050] Figure 2 It is a partial structural schematic diagram of a drill bit in the present application; Figure 1

[0051] Figure 3 It is a sectional view of a suction pipe in a hydraulic drilling system for drill-in casing pile in an embodiment of the present application;

[0052] Figure 4 It is a top view sectional view of an underreaming tooth plate in an expanded state in a hydraulic drilling system for drill-in casing pile in an embodiment of the present application;

[0053] Figure 5 It is a top view sectional view of an underreaming tooth plate in a folded state in a hydraulic drilling system for drill-in casing pile in an embodiment of the present application;

[0054] Figure 6 It is a sectional view of a drill bit in a hydraulic drilling system for drill-in casing pile in another embodiment of the present application;

[0055] Figure 7 It is a top view sectional view of an underreaming tooth plate in a folded state in a hydraulic drilling system for drill-in casing pile in another embodiment of the present application;

[0056] Figure 8 It is a top view sectional view of an underreaming tooth plate in an expanded state in a hydraulic drilling system for drill-in casing pile in another embodiment of the present application.

[0057] REFERENCE NUMERALS: ​

[0058] 1. Pipe piles;

[0059] 2. Spiral drill rod;

[0060] 3. Jet suction tube; 31. Tube body; 32. Jet nozzle; 33. Throat tube;

[0061] 4. Drill bit; 41. Cavity; 411. Second flow channel; 412. Third flow channel; 42. Hole-reducing cutting plate; 421. First flow channel; 422. Jet nozzle; 43. Bottom cutting plate;

[0062] 5. Injection chamber; 51. Inlet;

[0063] 6. Nozzle assembly; 61. First radial nozzle; 62. Second radial nozzle; 63. Axial nozzle;

[0064] 7. Sand removal cylinder; 71. Recovery port; 72. Annular sand and gravel chamber; 721. Sand discharge port; 73. Spiral blades;

[0065] 8. Drilling rig; 81. Mud pump; 82. Mud pit. Detailed Implementation

[0066] The hydraulic drilling system and construction method for drilling and casing piles of the present invention will be described in more detail below with reference to the schematic diagrams, which illustrate preferred embodiments of the invention. It should be understood that those skilled in the art can modify the invention described herein while still achieving the advantageous effects of the invention. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the invention.

[0067] The invention is described more specifically by way of example in the following paragraphs with reference to the accompanying drawings. The advantages and features of the invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0068] Example 1

[0069] like Figures 1 to 3 As shown in the figure, an embodiment of the present invention proposes a hydraulic drilling system for drilling and pipe piles, including a pipe pile 1, a spiral drill rod 2, a suction pipe 3, and a drill bit 4.

[0070] The auger drill rod 2 is rotatably installed inside the pipe pile 1, with one end of the auger drill rod 2 passing through the pipe pile 1 and sequentially connected to the jet suction pipe 3 and the drill bit 4. The auger drill rod 2 drives the drill bit 4 to rotate, thereby completing the drilling operation.

[0071] And the spiral drill pipe 2 and the pipe pile 1 can move synchronously in the direction perpendicular to the construction surface, and the spiral drill pipe 2 is a hollow structure and is connected with the slurry pump 81 which inputs clean water at the open top end. The synchronous feeding of the spiral drill pipe 2 and the pipe pile 1 ensures the coordinated advancement of the drilling and the pipe pile operation, avoids the collapse risk of the hole wall due to the lagging support, and guarantees the fitting accuracy of the pipe pile 1 and the stratum in the pile forming process. And by setting the spiral drill pipe 2 as a hollow structure, the hollow channel formed in the inside of the spiral drill pipe 2 can provide a transmission path for the high-pressure clean water, so that the clean water can directly reach the jetting pipe 3 and the drill bit 4 after being input by the slurry pump 81, and provide a power source for the subsequent operation of the jetting pipe 3 and provide a cleaning liquid for the drill bit 4.

[0072] Specifically, the jetting pipe 3 is in communication with the spiral drill pipe 2 and the drill bit 4 for the transmission of clean water.

[0073] It should be noted that the jetting pipe 3 forms a jetting cavity 5 inside, and the jetting cavity 5 is provided with a suction inlet 51 which is in communication with the external environment. The suction inlet 51 is provided for sucking the broken particles formed in the drilling process.

[0074] When the clean water flows through the jetting pipe 3 (as shown by the solid arrows in Figure 3 , the jetting cavity 5 can form a negative pressure chamber to suck the broken particles formed in the drilling process through the suction inlet 51 (as shown by the dotted arrows in Figure 3 ), so that the broken particles and the clean water form an abrasive water jet. That is, the jetting cavity 5 forms a negative pressure chamber when the clean water is transmitted, so that the suction inlet 51 can actively suck the broken particles formed in the drilling process, and the broken particles and the clean water are mixed to form an abrasive water jet for subsequent ejection of the drill bit 4. Compared with the existing technology which uses mud as a cleaning liquid, the device does not need to rely on the slurry pump 81 to suck the sand slurry in this process, thereby effectively avoiding the problem of abrasion loss caused by the direct contact of the impeller, the pipeline and the broken particles of the slurry pump 81, and improving the durability of the equipment.

[0075] In addition, due to the jet flow entrainment effect of the jetting pipe 3 (as shown by the dotted arrows in Figure 3 , a local circulation flow field can be formed at the bottom of the hole, thereby further improving the upward velocity of the mixed liquid formed by the broken particles (i.e. the cuttings outside the jetting pipe 3) and the clean water, achieving the purpose of preventing the deposition of the cuttings and enhancing the clean water carrying effect.

[0076] It should be further noted that the drill bit 4 has a nozzle assembly 6 for spraying clean water and the abrasive water jet. That is, the abrasive water jet formed by the mixing of the broken particles and the clean water enables the drill bit 4 to significantly enhance the erosion ability and the carrying effect of the rock when it is running, that is, to strengthen the rock breaking ability.

[0077] The device is provided with a suction pipe 3 with a suction chamber 5 and a suction inlet 51, which is communicated with the hollow structure of the screw drill pipe 2 and the drill bit 4 with the nozzle assembly 6, so that the broken particles formed in the drilling process can be automatically sucked in by the negative pressure suction effect of the suction chamber 5 when the clean water is input into the screw drill pipe 2, and the broken particles can be mixed with the clean water to form an abrasive water jet and sprayed out through the nozzle assembly 6 of the drill bit 4, so as to improve the rock breaking ability of the drill bit 4 by means of the characteristics of the abrasive water jet, that is, to strengthen the rock breaking ability.

[0078] Moreover, the jet flow suction effect of the suction pipe 3 can form a local circulation flow field at the bottom of the hole, which can further improve the upward speed of the mixed liquid formed by the broken particles and the clean water, so as to prevent the deposition of rock debris and enhance the clean water carrying effect.

[0079] In addition, the device uses clean water input and negative pressure suction mechanism of the suction pipe 3 to replace the application of mud as cleaning liquid in the prior art, so that the mud pump 81 does not directly contact the particles in the mud during the whole process, thereby avoiding the wear of the mud pump 81, achieving the purposes of improving the durability of the equipment, simplifying the construction equipment and eliminating the risk of mud pollution.

[0080] Please continue to refer to Figure 3 In further embodiments, a specific suction pipe 3 is also proposed to improve the suction effect of the broken particles and improve the rock breaking ability of the subsequent drill bit 4.

[0081] Specifically, the suction pipe 3 includes a pipe body 31, a jet nozzle 32 and a throat pipe 33, and the two ends of the pipe body 31 are respectively detachably and sealingly connected with the screw drill pipe 2 and the drill bit 4. This connection mode makes the suction pipe 3 have good maintainability and sealing performance in the whole system, which is convenient for installation, disassembly and daily maintenance of the equipment, and can effectively prevent leakage of high-pressure clean water during transmission, so as to ensure stable system pressure and provide a stable working environment for subsequent operation.

[0082] The jet nozzle 32 and the throat pipe 33 are sequentially arranged in the pipe body 31 from the direction away from the screw drill pipe 2, and a gap is reserved between the output end of the jet nozzle 32 and the throat pipe 33, so that the jet nozzle 32, the pipe body 31 and the throat pipe 33 surround a negative pressure chamber, i.e. the suction chamber 5.

[0083] That is, when the high-pressure water (mud pump 81 input will exert pressure on the water) from the spiral drill pipe 2 to the jet nozzle 32, the jet nozzle 32 will accelerate the water into a high-speed jet, based on the Bernoulli principle, high-speed jet will form a low pressure zone between the output end of the jet nozzle 32 and the throat 33 gap, so that the suction chamber 5 forms a negative pressure chamber. At this time, under the action of negative pressure, the suction inlet 51 will actively suck the broken particles at the bottom of the hole, so that the broken particles are mixed to form an abrasive water jet, and then input into the drill bit 4. Under the action of the nozzle assembly 6, the drill bit 4 completes the ejection of the abrasive water jet, thereby significantly enhancing the rock breaking efficiency of the drill bit 4 and achieving the strengthening of the rock breaking capacity.

[0084] And in the process, because the suction chamber 5 can form a negative pressure chamber, and under the action of negative pressure, the suction inlet 51 will actively suck the broken particles at the bottom of the hole, thereby providing an upward force on the broken particles (cuttings) at the bottom of the hole and the water, thereby corresponding to the upward speed of the mixed liquid formed by the broken particles and the water, to prevent the deposition of cuttings and enhance the cuttings carrying effect of the water.

[0085] It should be noted that the center lines of the jet nozzle 32, the throat 33 and the pipe body 31 coincide. So that the suction pipe 3 can stably and efficiently form a negative pressure when running, more stably and efficiently suck the broken particles at the bottom of the hole through the suction inlet 51, form a uniform and strong grinding abrasive water jet, further enhance the rock breaking efficiency of the drill bit 4, and more reliably strengthen the rock breaking capacity.

[0086] In this embodiment, the throat 33 can prevent the fluid in the drill bit 4 from flowing back to the suction chamber 5, that is, it plays a role in preventing backflow.

[0087] As shown in Figures 4 to 5 In other embodiments, a specific drill bit 4 is also proposed to better complete the drilling operation.

[0088] Specifically, the drill bit 4 includes a cavity 41, a reaming pick plate 42, and a bottom pick plate 43.

[0089] Among them, the reaming pick plate 42 is rotatably installed on the outer wall of the cavity 41, and has a folding state and an expansion state to meet the application requirements under different working conditions.

[0090] It should be noted that the folding state and the expansion state are switched by the rotation direction of the spiral drill pipe 2 and the reaction force received by the reaming pick plate 42 when contacting the stratum.

[0091] It should be noted that when the reaming pick plate 42 is in the folded state, the outer diameter of the drill bit 4 is smaller than the inner diameter of the pipe pile 1, facilitating the disengagement of the reaming pick plate 42 from the pipe pile 1.

[0092] The reaming pick plate 42 is internally provided with a first flow channel 421 and a jet nozzle 422 in communication with the first flow channel 421.

[0093] The outer side of the cavity 41 is formed with a mounting seat for mounting the reaming pick plate 42, and the cavity 41 and the mounting seat are respectively provided with a second flow channel 411 and a third flow channel 412 in communication with each other.

[0094] When the reaming pick plate 42 is in the expanded state, the first flow channel 421, the second flow channel 411 and the third flow channel 412 are sequentially communicated, so that the high-pressure fluid can enter the jet nozzle 422 through the first flow channel 421, the second flow channel 411 and the third flow channel 412 to form a high-speed jet.

[0095] In addition, when the reaming pick plate 42 is in the folded state, the third flow channel 412 is disconnected from the first flow channel 421, and at this time the pivot shaft of the reaming pick plate 42 is located at the outlet of the third flow channel 412, so that the high-pressure fluid can be sequentially sprayed out of the second flow channel 411 and the third flow channel 412, completing the cleaning of the pivot shaft of the reaming pick plate 42.

[0096] The present embodiment forms a high-speed jet by allowing high-pressure fluid to enter the reaming pick plate 42, which not only completes the cleaning of the pivot shaft, but also directly contacts the soil layer of the area to be reamed, completes the auxiliary reaming operation, and achieves the purpose of further enhancing the drilling performance of the drill bit 4.

[0097] Please continue to refer to Figure 1 In the present embodiment, the system further comprises a sand removal cylinder 7, which is detachably fixedly installed on the end outer wall of the pipe pile 1.

[0098] The spiral drill rod 2 can transport the mixed liquid formed during the drilling process along the inner wall of the pipe pile 1 to the sand removal cylinder 7.

[0099] In a specific example, the outer wall of the spiral drill rod 2 is provided with a spiral blade, and the spiral blade is attached to the inner wall of the pipe pile 1, that is, the transportation of the mixed liquid is completed by the spiral auger transportation, which is a conventional technical means in the prior art, and therefore will not be described here.

[0100] In the embodiment, the top side of the sand removal cylinder 7 is provided with a recovery port 71 for recovering clean water in the mixed liquid, and the slurry pump 81 is connected with the recovery port 71 and the top opening of the auger rod 2 through a pipeline for recycling the clean water. Through this connection mode, when the mixed liquid enters the sand removal cylinder 7, the separated clean water can be sucked out from the recovery port 71, that is, the slurry pump 81 can deliver the recovered clean water to the top opening of the auger rod 2 through the pipeline, and then the clean water enters the drill bit 4 again to participate in the operation, so that the consumption of clean water can be significantly reduced during the whole drilling operation process by means of the recycling characteristics driven by the slurry pump 81, the construction cost is reduced, and the environmental pollution caused by a large amount of discharged mixed liquid is avoided, and the efficient use of resources and green construction are realized.

[0101] In addition, the inner cavity bottom wall of the sand removal cylinder 7 has an annular sand cavity 72 for collecting broken particles in the mixed liquid, and one side of the annular sand cavity 72 is provided with a sand discharge port 721. When the mixed liquid enters the sand removal cylinder 7, the broken particles in the mixed liquid will gradually settle and gather in the annular sand cavity 72 under the action of gravity and fluid movement in the sand removal cylinder 7, and the setting of the sand discharge port 721 enables the broken particles collected in the annular sand cavity 72 to be discharged periodically. Through this design, the sand removal cylinder 7 can effectively separate sand and stone in the mixed liquid by means of the characteristics of collecting broken particles in the annular sand cavity 72 and discharging the broken particles through the sand discharge port 721 during operation, so that the recovered clean water is relatively pure, and the normal operation of the equipment is not affected by the accumulation of broken particles, the efficient and stable sand removal function is realized, and the reliable operation of the equipment is realized.

[0102] In further embodiments, the inner wall of the sand removal cylinder 7 is further fixedly installed with a spiral blade 73 which is reversely arranged with the blade on the auger rod 2, for accelerating the separation and deposition of broken particles in the mixed liquid. The spiral blade 73 causes the mixed liquid entering the sand removal cylinder 7 to produce rotational flow (i.e. centrifugal effect), so that the broken particles in the mixed liquid are thrown to the inner wall of the sand removal cylinder 7, and then move downward along the direction of the spiral blade 73, while the clean water remains in the central area due to its small density, and is sucked out by the slurry pump 81 through the recovery port 71. Therefore, compared with the gravity separation method alone, the purpose of accelerating separation can be achieved.

[0103] Please continue to refer to Figure 1 In other embodiments, the hydraulic drilling system is further limited to better realize the efficient cooling of the drill bit 4 and the function of assisting rock breaking and debris removal.

[0104] Specifically, the hydraulic drilling system further comprises a drilling machine 8, a slurry pump 81 and a slurry tank 82, and the slurry pump 81 and the slurry tank 82 are both fixed to the drilling machine 8, so as to facilitate movement during construction, and at the same time, the self-weight of the drilling machine 8 is increased, so as to provide greater drilling pressure for the drill bit 4.

[0105] The mud pump 81 is connected to the top opening of the auger rod 2 via a pipeline connection structure and a water tap. Specifically, the water tap includes a rotating sleeve part and a fixed sleeve part arranged sequentially from bottom to top. One end of the rotating sleeve part is fixedly connected to the top opening of the auger rod 2, and the other end is rotatably connected to the fixed sleeve part. The fixed sleeve part is connected to the mud pump 81 via a pipeline connection structure, so that when the auger rod 2 is spirally fed, it will not interfere with the input of clean water, thus ensuring the stability of the equipment operation.

[0106] Example 2

[0107] like Figures 6 to 8 As shown, the difference between this embodiment and Embodiment 1 is that an alternative drill bit 4 structure is proposed to optimize the structure between the cavity 41 and the reaming cutting plate 42, thereby further improving the drilling performance of the drill bit 4.

[0108] Specifically, the drill bit 4 includes a cavity 41, a reaming cutting plate 42, and a bottom cutting plate 43.

[0109] In this embodiment, the switching of the state of the enlarged cutting tooth plate 42 is further explained as follows.

[0110] For example, when the auger rod 2 rotates clockwise ( Figure 8 When rotating (as shown in the Va direction), the reaming cutting plate 42 is affected by the reaction force of the stratum, changing from a closed state to an expanded state. In the expanded state, the cutting edges on the reaming cutting plate 42 can expand the diameter of the hole wall, making the borehole diameter match the outer diameter of the pipe pile 1. This ensures that the pipe pile 1 is tightly attached to the stratum, enhances the stability of the pipe pile 1 in the hole, and improves the bearing capacity of the entire pile foundation.

[0111] When the auger rod 2 rotates counterclockwise (i.e., in the opposite direction to Va), the reaming cutting plate 42 is subjected to the reaction force of the stratum, returning from the expanded state to the closed state. At this time, the outer diameter of the reaming cutting plate 42 is smaller than the inner diameter of the pipe pile 1, which facilitates the smooth withdrawal of the drill bit 4 from the pipe pile 1. This prevents the drill bit 4 from colliding or getting stuck with the pipe pile 1 during the withdrawal process after the installation of the pipe pile 1 is completed, thus improving construction efficiency and the service life of the equipment.

[0112] The design of the reaming cutter plate 42, which is rotatable and has two working states, allows the drill bit 4 to effectively enlarge the borehole diameter by utilizing the characteristics of the different states of the reaming cutter plate 42, ensuring a good connection between the pipe pile 1 and the stratum, while also facilitating the smooth withdrawal of the drill bit 4, thus improving the borehole enlargement and equipment operation convenience.

[0113] The bottom cutting plate 43 is fixedly installed at the bottom of the cavity 41 and is used for drilling the bottom.

[0114] In other embodiments, the reaming pick plate 42 is provided in plurality, and the plurality of reaming pick plates 42 are arranged in a ring array with the axial center line of the cavity 41 as the center. In this embodiment, two reaming pick plates 42 are provided to improve the reaming rate.

[0115] In the prior art, the drill bit 4 is usually connected and assembled with other components by threads to ensure sealing performance. However, in this embodiment, the drill bit 4 needs to rotate in both forward and reverse directions, and thus if the connection between the drill bit 4 and the jet suction pipe 3 is simply achieved by threads, there is a risk of loosening. Therefore, the connection relationship between the drill bit 4 and the jet suction pipe 3 is further limited to improve the stability of the drill bit 4 during operation.

[0116] Specifically, the jet suction pipe 3 and the drill bit 4 are connected and sealed by threads, and the outer wall of the cavity 41 of the drill bit 4 is provided with a limiting block installed by a screw, and the outer wall of the jet suction pipe 3 is provided with a limiting groove matched with the limiting block. When the jet suction pipe 3 and the drill bit 4 are connected by threads, the installation position of the limiting block and the limiting groove are located in the same vertical plane, and at this time, the limiting block is installed on the outer wall of the cavity 41 to axially limit the jet suction pipe 3 and the drill bit 4, thereby achieving the purpose of improving the stability of the drill bit 4 during operation.

[0117] It should be further pointed out that the jet suction pipe 3 and the spiral drill pipe 2 are also connected in the manner of the jet suction pipe 3 and the drill bit 4 as described above to ensure the connection sealing performance and stability, which will not be described here.

[0118] Please continue to refer to Figures 6 to 8 This embodiment further limits the nozzle assembly 6 to improve the rock breaking ability of the drill bit 4, and at the same time, the drill bit 4 can stably switch between the folded state and the expanded state to avoid being stuck.

[0119] Specifically, the nozzle assembly 6 includes a first radial nozzle 61 and a second radial nozzle 62 arranged in the cavity 41.

[0120] The opening direction of the first radial nozzle 61 is towards the rotating joint of the reaming tooth plate 42 and the cavity 41. By setting the opening direction of the first radial nozzle 61 towards the rotating joint of the reaming tooth plate 42 and the cavity 41 (such as the rotating shaft), when the first radial nozzle 61 sprays low-pressure clean water, the clean water can directly act on the rotating joint, so as to play a role in lubricating the rotating shaft, that is, reducing the friction between the rotating parts, reducing wear and tear, and prolonging the service life of the equipment. And it can also flush the rock debris deposited on the rotating shaft, avoid the accumulation of rock debris causing the reaming tooth plate 42 to appear stuck when switching state, ensure that the reaming tooth plate 42 can flexibly switch between the folded state and the expanded state, and protect the normal operation of the equipment.

[0121] The opening direction of the second radial nozzle 62 is towards the direction to be operated when the reaming tooth plate 42 is operated. By setting the second radial nozzle 62, high-pressure abrasive water jet is used for spraying. That is, when the reaming tooth plate 42 is operated, the high-pressure abrasive water jet can act on the rock layer to be broken in advance, assisting the reaming tooth plate 42 to break hard rock. Compared with simply relying on mechanical breaking of the reaming tooth plate 42, the high-pressure abrasive water jet can damage the rock layer to a certain extent, reduce the strength of the rock layer, thereby reducing the mechanical load of the reaming tooth plate 42, improving the rock breaking efficiency, and also reducing the wear of the reaming tooth plate 42, prolonging the service life of the reaming tooth plate 42.

[0122] It should be noted that when the reaming tooth plate 42 is in the folded state, the opening of the second radial nozzle 62 is towards the reaming tooth plate 42, so that when the reaming tooth plate 42 is switched from the folded state to the expanded state, the reaming tooth plate 42 can not only be subjected to the rotating power of the spiral drill rod 2 and the reaction force of the stratum, but also be assisted by the fluid power of the second radial nozzle 62 to expand.

[0123] The inner diameter of the first radial nozzle 61 increases along the output direction, and the inner diameter of the second radial nozzle 62 decreases along the output direction. That is, the first radial nozzle 61 adopts a diffusion type structure with increasing inner diameter to reduce the jet velocity, increase the action area, reduce the erosion effect of the abrasive water jet on the rotating shaft of the reaming tooth plate 42, and strengthen the flushing effect. The second radial nozzle 62 adopts a converging type structure with decreasing inner diameter to reduce the water head loss, increase the jet velocity, enhance the impact force on the rock layer during reaming operation, and further improve the flushing and cooling effect on the edge tooth of the reaming tooth plate 42.

[0124] In further embodiments, the nozzle assembly 6 further comprises an axial nozzle 63 arranged in the cavity 41, for assisting the bottom tooth plate 43 to perform drilling operation.

[0125] Embodiment three

[0126] The embodiment further proposes a construction method of the drill-in pile following pipe pile on the basis of the embodiment two, which is realized by using the drill-in pile following pipe pile hydraulic drilling system in the embodiment one, and specifically includes the following steps.

[0127] S1, the auger drill rod 2 is extended into the bottom of the pipe pile 1;

[0128] S2, the auger drill rod 2 is controlled to rotate in the determined direction, and the drill bit 4 is driven to operate synchronously to drill into the stratum;

[0129] S3, the clean water is output by the mud pump 81, and the power is input into the jet suction cavity 5 of the jet suction pipe 3 through the hollow cavity of the auger drill rod 2, under the high pressure impact of the clean water, the jet suction cavity 5 forms a negative pressure chamber, so as to suck the broken particles formed in the drilling process through the suction port 51 in real time, and the broken particles are mixed with the clean water to form an abrasive water jet, and the abrasive water jet is sprayed out of the nozzle assembly 6 of the drill bit 4 to assist the drill bit 4 in breaking rocks;

[0130] S4, the pipe pile 1 is controlled to move downward along the direction perpendicular to the construction surface following the auger drill rod 2;

[0131] S5, when the pipe pile 1 is sunk to the preset depth, the auger drill rod 2, the jet suction pipe 3 and the drill bit 4 are lifted away from the bottom of the hole.

[0132] The method controls the rotation feeding of the auger drill rod 2 and the synchronous downward movement of the pipe pile 1, uses the clean water input by the mud pump 81 to form a negative pressure to suck the broken particles in the jet suction pipe 3, mixes the broken particles with the clean water to form an abrasive water jet, and sprays the abrasive water jet out of the nozzle assembly 6 of the drill bit 4 to complete the auxiliary breaking and cutting of rocks, and when the pipe pile 1 is sunk to the preset depth, the drilling tools are separated, and the construction and installation of the pipe pile 1 are completed. Since the clean water input and the negative pressure suction mechanism of the jet suction pipe 3 are used in the process to replace the mud as the cleaning liquid in the prior art, the mud pump 81 does not directly contact the particles in the mud in the whole process, thereby avoiding the wear of the mud pump 81, and the purposes of improving the durability of the equipment, simplifying the construction equipment and eliminating the pollution risk of the mud are achieved.

[0133] In other embodiments, the step S2 further includes the following steps:

[0134] When the drill bit 4 is in contact with the construction surface, the top end of the auger drill rod 2 is inputted with clean water by the mud pump 81, so that the first radial nozzle 61 provides a jetting force to the reaming tooth plate 42 of the drill bit 4 from the closing state to the expansion state. That is, through the directional jetting characteristics of the first radial nozzle 61, before the auger drill rod 2 starts to rotate, the jetting force consistent with the expansion direction of the reaming tooth plate 42 can be applied to the reaming tooth plate 42, and the ground reaction force forms a “double drive”, especially in hard rock strata or when the initial drilling resistance is large, the starting torque required for the reaming tooth plate 42 to open can be effectively reduced, the jamming phenomenon caused by excessive friction can be avoided, the reaming tooth plate 42 can be quickly and stably put into the working state, and the connection efficiency of the drilling and reaming processes and the equipment reliability are improved.

[0135] In further embodiments, step S5 is further described. For example, when it is necessary to control the auger drill rod 2, the suction pipe 3 and the drill bit 4 to be lifted from the hollow of the pipe pile 1, the auger drill rod 2 needs to be controlled to rotate in the direction opposite to the predetermined direction (for example, the Va direction), at this time, under the reaction force of the stratum, the reaming tooth plate 42 is deflected in the direction opposite to the Va direction, so as to complete the switching of the reaming tooth plate 42 from the expansion state to the closing state, and because the outer diameter of the reaming tooth plate 42 in the closing state is smaller than the inner diameter of the pipe pile 1, so that during the lifting process, no interference is formed, and the stability of the construction process is improved. Figure 8

[0136] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.​

Claims

1. A hydraulic drilling system for drilling while following a pipe pile, characterized in that, The pipe pile, the spiral drill pipe, the suction pipe and the drill bit; The spiral drill pipe is rotatably installed inside the pipe pile, and one end of the spiral drill pipe penetrates through the pipe pile and is connected with the suction pipe and the drill bit in sequence; The spiral drill pipe and the pipe pile can move synchronously in the direction perpendicular to the construction surface, and the spiral drill pipe is a hollow structure and is connected with the slurry pump for inputting clean water at the top end opening; The suction pipe is communicated with the spiral drill pipe and the drill bit and is used for transmitting clean water; The suction pipe is internally formed with a suction chamber, and the suction chamber is provided with a suction inlet communicated with the external environment; When the clean water flows through the suction pipe, the suction chamber can form a negative pressure chamber to suck the broken particles formed in the drilling process through the suction inlet, so that the broken particles and the clean water form an abrasive water jet; The drill bit is provided with a nozzle assembly for spraying clean water and the abrasive water jet; The suction pipe comprises a pipe body, a jet nozzle and a throat pipe; Two ends of the pipe body are respectively detachably and sealingly connected with the spiral drill pipe and the drill bit; The jet nozzle and the throat pipe are sequentially arranged in the pipe body from the direction away from the spiral drill pipe, and a gap is reserved between the output end of the jet nozzle and the throat pipe, so that the jet nozzle, the pipe body and the throat pipe surround the suction chamber capable of forming a negative pressure chamber; The drill bit comprises a cavity, an expanding reamer plate and a bottom reamer plate; The expanding reamer plate is rotatably installed on the outer wall of the cavity and has a folded state and an expanded state; The folded state and the expanded state are switched by the rotation direction of the spiral drill pipe and the reaction force received by the expanding reamer plate when contacting the stratum; When the expanding reamer plate is in the folded state, the outer diameter of the drill bit is smaller than the inner diameter of the pipe pile; The bottom reamer plate is fixedly installed at the bottom of the cavity.

2. The hydrodynamic drilling system for drilling while following the pipe pile as claimed in claim 1, characterized by, The expanding reamer plate is internally provided with a first flow channel and a jet nozzle communicated with the first flow channel; The outer side of the cavity is formed with a mounting seat for mounting the expanding reamer plate, and the cavity and the mounting seat are respectively provided with a second flow channel and a third flow channel communicated with each other; When the expanding reamer plate is in the expanded state, the first flow channel, the second flow channel and the third flow channel are sequentially communicated; When the expanding reamer plate is in the folded state, the third flow channel is disconnected with the first flow channel, and the outlet of the third flow channel is just directed to the rotating shaft of the expanding reamer plate.

3. The hydrodynamic drilling system for drilling while casing piles as claimed in claim 1, wherein, A plurality of expanding reamer plates are arranged in a ring array around the axial line of the cavity.

4. The hydrodynamic drilling system for drilling while casing piles as claimed in claim 1, wherein, The nozzle assembly comprises a first radial nozzle and a second radial nozzle arranged in the cavity; The opening direction of the first radial nozzle is directed to the rotating connection position of the expanding reamer plate and the cavity; The opening direction of the second radial nozzle is directed to the direction to be operated when the expanding reamer plate is operated; When the expanding reamer plate is in the folded state, the opening of the second radial nozzle is directed to the expanding reamer plate. The inner diameter of the first radial nozzle increases in the output direction, and the inner diameter of the second radial nozzle decreases in the output direction.

5. The hydrodynamic drilling system for drilling while following the pipe pile as claimed in claim 1, characterized by, The nozzle assembly further comprises an axial nozzle arranged in the cavity to assist the bottom cutting shoe plate in drilling operation.

6. The hydrodynamic drilling system for drilling while following the pipe pile as claimed in claim 1, characterized by, Further comprising a sand removal cylinder; The sand removal cylinder is detachably fixed on the outer wall of the end of the pipe pile, and the auger rod can transport the mixed liquid formed during the drilling process along the inner wall of the pipe pile to the sand removal cylinder; The top end of the sand removal cylinder is provided with a recovery port for recovering clean water in the mixed liquid, and the mud pump is connected with the recovery port and the top end opening of the auger rod through pipelines for recycling the clean water; The inner cavity bottom wall of the sand removal cylinder has an annular sand cavity for collecting broken particles in the mixed liquid, and one side of the annular sand cavity is provided with a sand discharge port; The inner wall of the sand removal cylinder is further fixedly provided with a spiral blade opposite to the upper blade of the auger rod for accelerating the separation and deposition of broken particles in the mixed liquid.

7. The hydrodynamic drilling system for drilling while following the pipe pile according to claim 6, characterized by, The hydraulic drilling system further comprises a drilling machine and a mud pool connected with the auger rod; The mud pool and the mud pump are fixed on the drilling machine, and the mud pool is in communication with the recovery port; The mud pump is used to output the clean water input into the mud pool to the top end opening of the auger rod.

8. A method of construction of a pile following a drill, characterized in that, The hydraulic drilling system for following pipe pile while drilling is realized by using the hydraulic drilling system for following pipe pile while drilling according to any one of claims 1-7, and specifically comprises the following steps: S1, extending the auger rod into the bottom of the pipe pile; S2, controlling the auger rod to rotate in a predetermined direction to drive the drill bit to operate synchronously to drill into the stratum; S3, the clean water is output by the mud pump through the power of the mud pump into the jet suction cavity of the jet suction pipe through the hollow cavity of the auger rod, under the high pressure impact of the clean water, the jet suction cavity forms a negative pressure chamber to suck the broken particles formed during the drilling process through the suction port in real time, so that the broken particles and the clean water are mixed to form an abrasive water jet, and the abrasive water jet is sprayed out of the nozzle assembly of the drill bit to assist the drill bit in breaking rock; S4, controlling the pipe pile to move downward along the direction perpendicular to the construction surface following the auger rod; S5, when the pipe pile sinks to the preset depth, the auger rod, the jet suction pipe and the drill bit are lifted away from the bottom of the hole.

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